Love talking about this stuff. Don't know what's wrong about using "outdated 90's" tactics however. If they work, then use 'em. And the dump and chase still works and will continue to work long into the future.
Don't know much about swarm but I've used a variation of this approach on PK's. There are teams you can smother with it because they don't have the requisite skills and compete factors. And there are others that will pick you apart. Bottom line, it sounds like one has to have a very high skill and awareness level to make it work. A quick, accurate passing team like the Red Wings should be able to defeat the swarm pretty easily.
The other concern I would have is a team's ability to keep up the pace. Swarm sounds like the hockey equivalent of the 2 minute offense in football. Not sure any team can keep the pace up for 3 periods. Frankly, Box + 1 with a few adjustments works for me as well as any defensive zone scheme. The key has always been the transition to the breakout and defeating the forecheck.
Just completed my high school season and the most frequently used forechecking system was dump and chase with the chase turning into an aggressive 2-1-2/2 -3 type of forecheck.
Our key to defeating this is type of attack was having quick, strong, sure handed puck handling defensemen. Still a bit bothered that the Sabres traded (another? i.e.; McNabb and Myers?) one of those type of guys away recently.
MODS feel free to edit my response if to repetitive:
Swarm Defense 101:
The swarm defense was around before Eakins just to clarify. In the 80's and 90's most dzone coverage was basically Wingers cover the points high and tight strong side and slot on the weakside, strong side D and C battle in the corners, Net front stays in the slot or above the crease. As offense evolved teams began sending three forwards in the corner thus making the defenders have to create layers, usually now in a 'collapse dzone' (which is most common) two defensemen in the corner with the center between the puck and the net both winger down to a little lower than the tops of the circles.
The problem with the 'swarm defense' is when the puck battle begins in the corner (usually what happens is) the strong D and the Center go to create pins or a scrum puck. Once this occurs the strong side winger come down and fishes for the puck off the outside shoulder of the top forward and the weakside D comes in and does the same off the bottom forward. The weakside winger stays in the slot. The theory is commit 4 to the corner and out man the offense even if they send three, by also shutting down the wall to the strong side point.
Where the swarm becomes in effective is 3 things happen. 1) the forward quickly rims out to the D, because the strong side winger is low on the wall the d has an easy angle to shoot or moves the puck d to d with no shot blockers because they are all retreating back to the net. 2) the third offensive forward now slides down outside the scrum almost at the faceoff dot and gets a blind kickout pass that is very hard to stop. 3) the offense tries rimming to the weakside the weakside offensive d pinches with the third forward to 2v1 the weakside defensive winger.
Dump and Chase Theory
Whether it is Ted Nolan, Mike Babcock, Scott Bowman every coach wants possession time and to carry as opposed to dump when given the chance. I have watched all but three Sabres games, people can say what they want about the systems in my opinion it has nothing to do with systems. Every analyst/hockey expert picked the Sabres to finish 30th they are a very weak team starting with the back end and literally got way worse due to injury. With Gorges out for the year that is a ton of ice time regulated to below average players. On a playoff team at this stage in their career Bogosian was a #3 in Winnipeg, Zadarov and Ristolanian (sp?) would be at best 6/7, Beniot now being on the top pair 6/7, Strachan, Weber and Mezaros 5,6,7. Out side of the kids none are really skating D like a Letang, Doughty, Reilly, Subban ...etc. The Sabres D are more puck moving stay at home type and are being expected to play very big minutes that to be honest they aren't good enough or ready to play including the 19 and 20 yer old kids playing 3/4. The side effect is the Sabres get hemmed in their zone for long periods of time (Corsi stats say so) once they finally do break it out the forwards are tired they get the red dump and change. You usually end up either being countered or have to be in a passive 1-2-2, it the nature of the beast right now with their team.
In saying that the LA Kings last season as supplied by the Score earlier this year Analytically dumped the puck in the most of any team last season, the difference is that they also had the highest percentage of recovery in the NHL. I believe that fans love hearing all these Corsi stats and analytics but fail to realize that the teams that carry the puck most often and are possession teams (this is not backed up with data you can do your own and correct me) are teams like Pit (Crosby, Malkin), ANA (Perry, Getzlaf) Bos (Bergerion, Krejci) CHI (Toews, Sharp, Kane) Det (Datsyuk, Zetterberg) I think you get my point that the teams with the high possession numbers are the teams with bonafide superstars. Not teams with the depth or skill set of Buffalo this year.
Ted Nolan went to 4 Memorial Cups, Brian Trottier won 6 as a player and 1 as a coach in Colorado, Dan Flynn 5 Memorial Cups. The staff is solid they know how to develop players, they know systems, they also realize they can't ask plummers to be surgeons. Nolan stresses hard work and a never give up mentality, they need to play the perfect game every night and hope the other team is off because they are greatly out matched talent wise.
Regardless who the next coach is he will last 2 years if he isn't given talent to work with. Look at EDM Pat Quinn, Tom Renney, Ralph Krueger, Dallas Eakins and now Todd Nelson. Pat Quinn = 1,400 games coached in NHL, Tom Renney 595 games coached 260 wins, Ralph Kruger was the hottest coach not in the NHL took the Swiss to the next level in international hockey, Dallas Eakins - Everyone and their dog thought he was going to be the next Mike Babcock when he left the AHL. None had success with all the first rounders in EDM.
It is so easy to point the finger at the coaching staff in Buffalo, not showing significant systems, they literally don't have quality NHL players to perform against NHL with talent and good coaching.