Tannehill's accuracy on deep throws outside the hashes has improved, but it wasn't bad when he came into the NFL.
In 2012, our best vertical threat was Brian Hartline. In 2013 and 2014, Mike Wallace was the guy dialed up on those throws. Mike Wallace is actually lousy at catching deep vertical throws outside of the hashes, and the film bears that out. Go watch all of the deep shots to Wallace that were on target and dropped, misplayed, or caught out of bounds because Wallace's footwork on the sidelines was often atrocious. Watch the 2013 game vs Carolina. The Panthers were a team with a very good defense that was vulnerable deep. I told folks in VIP before the game 'we're going to dial up some deep balls and that's where our offense is going to come from.' And sure enough, it did. And sure enough, Mike Wallace actually had a chance to catch a touchdown to win the game at the end, but played it badly in the air and it slipped past his fingers at the goal line.
Watch his play in Minnesota and Baltimore too, if you don't believe me. Most of his production comes on underneath stuff. I personally think the guy needs contact lenses or LASIK. He doesn't have bad hands, but he plays balls really poorly when they're high in the air. I think it's eyesight related, and that's probably why nobody's ever figured it out. Not something you usually think about.