He's a relentless forchecker, and in my opinion, the best forchecker on the team already.
Rarely do you see sekac lose a puck battle, and even when it looks like he may have lost one, he finds a way to at least extend the battle.
On top of that, he's a responsible player that takes care of all three zones.
Shot wise, be has a good release... Works the boards well, which the habs really needed.
I believe I had him #4 on our HF prospect rankings in the summer, but you can make a case that he should have been as high as #1 now that we have seen him.
As far as comparisons go, I kind of see a middle class man's marian hossa in him, and that is no slight at all.