I really like all three of Beane's moves.
I fear 3rd and 2 yards of less situations for the Bills. They've needed a sledgehammer back like Fournette for a long time. Dorsey also needs a sustainment drive back, and a close out back. Harris was supposed to be that guy but he was hurt repeatedly.
The Bills are habitually bad at being up in games and sustaining drives to close them out. In the game against Tampa Bay, you just hammer the defense with Fournette in the second half and close those games out.
Joseph is the space eater the team needs. Just eat two blocks, let the other fast guys get freed up to move. Very smart, wish Beane had time earlier.
Douglas is needed. It's clear Elam was hurt/struggling, and Jackson isn't going to get it done long term opposite Benford.
These are the non-flashy moves Super Bowl contenders make.