We'll see. Blount's career was pretty similar. Strong rookie year, then tailed off. Maybe he rejuvenates his career here the way Blount did.
Hill's a big back, which the Pats lacked last year and it showed in the red zone.
I wouldn't say that Blount's career in Tampa "tailed off" as much as it got sidelined by a coaching change.
Blount produced 1021 yds from scrimmage and 6 TDs as a rookie, sharing totes with Cadillac Williams and Josh Freeman. In his second season, Tampa barely ran the ball at all (346 total attempts divided among Blount, Freeman, Earnest Graham and Kregg Lumpkin), and Blount produced 929 yds from scrimmage (including 148 receiving) and 5 TDs .
In Blount's third season, Schiano became the new HC, acquired V-Jax and drafted the Muscle Hamster - who immediately took virtually all the available carries (319 himself), while Blount's role was drastically reduced.
The Pats traded for him the following season - yet another example of the Pats taking advantage of a coaching change to acquire proven talent on the cheap.
Slightly different situation with Hill. Although the Bengals did add Joe Mixon via the draft in 2017, and did change OCs (Zampese to Lazor, after Hill was on IR), Hill's 2017 production dropoff was largely due to his ankle injury.
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It's difficult to say exactly how much not having a "big back" actually hurt the Pats last season. There was really a sea change in the type of ground game the Pats ran between 2016 and 2017.
In 2016, it was basically a one-man show, with Blount getting over 75% of the totes (and almost no passing tgts). In 2017, it was a committee, with the lead back (Lewis) getting only 45% of the totes with the strategy shifting to rotating three RBs who were all roughly equal threats to run or catch a pass (RB tgts increased dramatically).
The 2017 ground game was actually more efficient, too.
While rushing attempts dropped from 3rd in the league to 11th, rushing yards only dropped from 7th to 10th, and rushing TDs only dropped from 5th (19) to 6th (16), while yards per attempt actually increased from 25th (3.9) to 12th (4.2).
So, it's really not clear to me that having a "bigger back" would've made a significant difference, especially if he wasn't much of a receiving threat. While Hill seems to be a somewhat more capable receiver than Blount ever was (or that Gillislee has been), he's still nowhere close to the level of White and Burkhead.