If you feel he is a #2, you have to conclude that as such he needs more than 5 targets a game. Last year, with 48% more targets than the year before, he had 53% more yards.
Davis and Diggs have identical YAC (3.2 yards)---with Gabe having a much higher YBC. He gets the deeper look more often. Diggs gets a lot of short stuff and goes down immediately.
It's unfair to include a RB who often catches a pass in the backfield or just beyond and has more blockers downfield. Hence Cook's tiny YBC (2.6) and huge YAC (9.6)
Kincaid has thus far proven he is not guy who can get YAC. He catches 90% of his passes because he is barely across the line of scrimmage. He has a tiny YBC (3.4) and quickly gets tackled 3.6 yards away. He has only 118 yards after 5 games. Only 4 of 19 targets resulted in 1st down. You can't take away from your #2 to give targets to the checkdown guy.