Mahomes (as you pointed out), Hurts and throw in Jackson, whos' typically in the 70's or so--the differences are insignificant and therefore it's easily imaginable.
Your premise is faulty--it doesn't have to do with the "Offense he is expected to provide". Allen's INT% alone is higher than Mahomes, Jackson or Hurts---or Cousins (who accounted for 75% of Vikings yards last year) or....
then his INT rate should be as low as any of them.
that would require 2 new threads