Yes, the worst reach imaginable.
We are picking 7th. Theres only 6 teams ahead of us...Lane Johnson is the 3rd best LT. You want to use the #7 overall on the 3rd, THIRD, best player at a single position?
It doesn't really matter if he's the 3rd best OT. What matters is if he is one of the 7 best players. If the 7 best players in the draft were all OTs but we passed on one of them because we could take the best guy at another position even though he's an inferior player overall, we'd be idiots.
Personally, I don't think he's one of the 7 best players in this draft so I wouldn't take him. But that's why. Not because "he's the 3rd best tackle."