Julien did not revert back to his old system at all. The team continues to employ an aggressive up tempo style built around speed and transition.
Scoring is usually higher at the start of the season as teams are in the process of refining their defensive cohesiveness. Offence comes from capitalizing on defensive mistakes.......it is that simple.
I suspect you would be unable to tell me exactly what changes were made when Ducharme arrived and exactly what perceived reversals CJ allegedly implemented. You are only drawing your conclusion from a drop in scoring but your correlation is flawed and entirely inaccurate.
A lot of presumptions paraded as thinly veiled insults (if at all). Nice conversation piece.
For one, though, it is unclear if changes had been brought by Ducharme in the first place. It wasn't just a drop in scoring, though. I'd have to watch the season over to identify particulars but, the line combos definitely were of a much safer, more defensively sound variety as the season wore on. As the pressure mounted to eke into the playoffs, Julien was definitely trying to win games 0 to -1 all over again and I vaguely recall line deployment being an issue for me when the games were tight.
That's entirely normal for a coach to revert to what is familiar and safe when pressured. It could also have been Julien not clamping down as hard on defensive lapses in the first half of the season -- time, winning and come from behind victories always help in that respect...
However, with mounting pressure to make the playoffs, Julien must have been less confident in come from behind affairs and must've stressed the need to adhere fully to the system, if nothing else. Beyond that, it was coaching choices for line formations and deployment that skewed things, IMO.
The system is up tempo, as you say but, it is a counter-attack system, with 5-player support in all three zones, including the O-zone once puck control is established.
In fact, it's not very different than a majority of NHL teams, other than zone D VS man-to-man D and forecheck variations, etc. Most tams have a variation of the same general principles, from what I have gathered.
I'm not sure if any NHL teams have pure or primarily offensive systems but, I doubt any do. However, I truthfully don't watch all teams play regularly. I presume that offensively stacked teams with weak Ds tend to revert to run and gun offense when they regularly trail from behind...