You are proxying position for the main factor in completion %, pass length by assuming RBs catch shorter passes than wide receivers. I think that’s generally reasonable, but it doesn’t work for MIA and NE’s TE targets.

MIA: 50 completions last year to TEs, avg pass length 5.38 yards
NE: 53 completions to TEs, avg pass length 8.47 yards

MIA: 28 incomplete passes targeted to TEs, avg pass length 7.86 yards
NE: 39 incomplete passes targeted to TEs, avg pass length 11.67 yards

NE should have a lower completion % than MIA. Brady’s passes to TEs were longer on average than his passes to other receivers, while Tannehill’s passes to TEs were shorter on average than his passes to other receivers.

I seem to remember Brian Burke showing that contrary to convention wisdom rookie QBs don’t throw the ball to the TE very often.