Mike Gesicki, easily.
He came up big in a lot of key spots and was practically looking like the only legitimate player on the Dolphins' offense.
Again, hard to tell from a highlights package but I think Parker, Fuller and Waddle came up with some pretty key catches too, particularly Parker.
Shout out also for the big bodies in the defense who had some key moments there, particularly Wilkins & Sieler (the 3rd and 4th down stuffs in Q1 leading to the Brown TD run) and of course Roberts.
Game ball for me for Brissett though. Maybe the condensed package made it look better than it was, but it's hard to overlook what he did in that space.
https://www.youtube.com/watch?v=QyGDrrkL8Nc