It would be extremely short lived. Just keep rolling with 3 A’s until Nico (or whoever) is ready.
Here are Ruff’s recent comments about what he looks for in his captain:
"In my eyes, he's a very important player for you on the ice. Plays the game the right way, is respected by all his teammates. Selfless type of leader. When the game's on the line, he's a guy that's you're going to trust and encourage all the guys around you to follow."
I think most of that fits Zajac, but it also sounds like Nico to me. Especially the last part.