I remember when Tanner locked onto his first receiver back in 2011 (ya know, the only year he has had a decent supporting cast) and he completed 83 passes to Givens, 73 to Camp, 36 to Dembry, and 20 to Terrance Davis.
Tanner is just fine when surrounded by talent. Simple as that. Surround him with an O line that sucks and all you get is a 55% completion percentage and a 5-2 TD-INT ratio.