Gillislee is an enigma. With the Bills he ran north-south with power and speed. I didn’t see that last year. He always looked a bit tentative, especially the few times I saw him in the red zone. It’s like playing in the Pats system sucked the life out of his game. What was it? Was he overthinking? Not enough reps? Learning a tougher system?
Not necessarily "tougher", mainly just different - different line calls and change-ups/adjustments at the line, though possibly a little more complex (more complex passing game).
In terms of reps, it may be worth remembering that he'd been injured at some point and was not participating in practice during Training Camp until before the 3rd pre-season game.
The assumption among fans was always that the Pats had him slated to be the "lead back", projecting Gillislee to take over Blount's role, more or less in its entirety. I n was never confident that the Pats had that in mind for him at all (different type of runner and not even quite as hefty as Burkhead, much less Blount).
Blount absolutely dominated the offensive snap % for all RBs through most of 2016 (went over 50% a few times), averaged nearly 19 carries per game, and had between 24-29 carries in the first three games.
In Gillislee's time in Buffalo, he'd always been a part-time player, averaging around 30% of the snaps and 7-9 carries per game. He maxxed-out there with 101 totes in 15 games.
Even in week-1, Gillislee was in for only 30% of the snaps (White dominated the RB snap % until Lewis started hitting his stride in week-6). And Gillislee averaged 11.6 totes per game, hitting 40% of the snaps only in week-2 @NOL.
Based on his history (and the Pats' history), I originally projected Gillislee to get between 35% and 45% of the carries - pending a full recovery by Lewis. Well, Lewis most definitely recovered
fully, and dominated the carries thereafter. The rest is history, often interpreted in terms of unfulfilled fan expectations.