Worth noting there's never been more time to plan for a series than right now. Teams have months to prepare and gameplan for a specific opponent.
I've mentioned this earlier in the thread as well as factor to consider... You never know your opponent in advance, but now they basically given coaches 3 months advance notice to prepare for a best of 5 series. Toss out 70 game results and come up with a game plan to win 3 games to make this years playoffs, essentially a best of 5 regular season to decide if you qualify or not.
Coaches can watch as much game film and come up with all sorts of strategies to defend against specific players, PP formations etc.
I can picture Torts coming up with strategy where he will take a big 2-way physical centre like Boone Jenner and assign him as a spy to Auston Matthews and sit in his back pocket and shadow him all over the ice and engage him physically whenever he touches the puck in a shutdown role. Then will Keefe anticipate this and have plans in case to try and free him up, or will Matthews be prepared to fight through something like that, as an example of what could hypothetically happen under these conditions.
This twist certainly puts coaching at the forefront, with this much prep time to add the unpredictability of the outcomes of series. Its a reason why I give CBJ the advantage here in coaching where past experience will be beneficial. Keefe has likely watched last years TB vs Columbus series start to finish numerous times to gauge his opponents system and strategy as what to expect this year.
This also then extends to player and prep work where Matthews can in advance watch every single goal that was scored against CBJ goalies this year and know their weaknesses and strengths and even their tells and tendencies to know how best to beat them.