You gotta win, that's all
I like Cassidy but I'm not a fan of the way he's juggling his lines. I mean give them a chance for more than a period or two, with one another. Way too much juggling with them.
You have four arguably five top six forwards, three of them are all-world players, he should be able to find a way to get two scoring lines out of them. If not he's failed and right now with all his inconsistency in his line juggling he's failing.
Why not try Krejci with Marchy and Bjork/Cehlarik or Donato. Bergy with Pasta and Debrusk and play them together for 5-6 games.
He has two world class wingers , the top all around center in the league and one of the best play making centers in the league, he should be able to find a way too have two scoring lines.