starters in July mean absolutely jack and shit fellas, this is probably just a motivational technique. that being said, onto the "meta" discussion..
The fact that Tannehill played for Sherman in college is so huge. I have no idea what kind of offense Sherman ran in the NCAA but even if a fraction of it is the same Tannehill has a huge edge over other rookies. He was recruited to play for this coach, and this coach knows what he can and cannot do. It's huge. It can't be overstated. The league is full of first rounders who landed on teams who did not run a system they were comfortable with. So many times in the past a guy has been drafted in a particular slot just because all the draftniks believed that the slot was appropriate to his imaginary value.
The thing is, there is no such thing as a reach in the NFL draft. I -HATE- the term. If it's a guy you like, your favorite guy even, and its your turn to pick, then you get value out of it. People throw around trade down scenarios like that shit is easy to pull off. Like it's a video game and you can just force the CPU to take it. You don't know if a guy is still going to be there, you don't know if you are cluing other teams into your plans and someone is going to "reach" ahead of you, you don't know what the other team is going to want in exchange, and you have a very small amount of time to process this information and adapt to the draft board in front of you.
I say fuck it, "reach" ahead a few slots if you get your guy, theres a reason we have day jobs and the NFL GM's have theirs - and for that matter, theres a reason Mel Kiper and all the draft experts are not general managers. Mock drafts, that stupid fucking point value chart that jimmy johnson (or was it parcells? i forget) used like 20 years ago, and especially boom or bust prognostications when we havent even hit training camp yet - none of that means anything to real football.