Quite frankly, I'm a bit leery of the team adding any depth that wouldn't contribute on special teams.
Keenan Allen is primarily a slot WR which seems unnecessary given the receiving TE investment.
Kenny Moore may be on the decline. If I'm not mistaken, former scout Bryan Broaddus said he can't run anymore on one of his draft shows.
It would be interesting to see if Rasul Douglas would be interested in a depth role coming off a good season.