While it's true they weren't winning games with Drake, they weren't winning much without him either. What we do know is that he has about the equivalent of 1 Zeke-like workhorse season in his 3-yr career. 286 carries/94 catches = 380 touches. And with those 380 touches, he averaged 4.7 YPC with 2120 total yards. Zeke had 381 touches last year, with the same 4.7 YPC, with 2002 total yards.
What we don't know is how he would handle a workhorse load over an entire season, because he hasn't been tested yet. The only glimpse was a 5 game stretch at the end of 2017. He had 91 carries for 444 yards (4.9 YPC), to go along with 17 catches for 150 yards (8.8 YPR). Now, I am not a fan of extrapolating small sample sizes, but I will do it here - over a 16 game season, that would equate to 291 carries for 1427 yards and 54 catches for 480 yards = 345 touches for 1907 yards. Would he have been able to keep up that pace for 16 games? We can't be sure, but my guess is no.
I think Drake is a good RB, but best suited for a shared role. I see about a 60/40 split in Drake's favor, with Drake dominating the receptions.