Bennett attempts to continue the forecheck with 3 opposing Sabres below the dot, 2 forwards starting to make their way back. Worst case scenario is there's an outlet pass to the Sabre by the boards with speed and becomes a 2 on 2, which isn't likely.
A couple great passes later and Foligno finds him in a 1v2. Kulak is a little far up thinking of challenging the Sabre who passed to Foligno, and is caught behind. Engelland doesn't compensate for the space between him and his defense partner, Foligno attempts to slip by and walks around an outplayed Engelland.
Things that could have happened differently to have prevented the goal:
* Engelland doesn't get walked around
* Kulak and Engelland are in position
* Brouwer doesn't miss his stick check
* Bennett clogs the neutral zone with his defensmen
I don't know how you can say that the goal is evidence of Bennett's growing pains full time at centre. The play in itself? I don't think it was a bad play in itself to potentially generate more offense.