I hope you realize that Jordan Gross is "only" 6'4.
You're right. But in this new form of the NFL, this breed of players are changing at a way that no one has ever seen before. Prospects today are coming out bigger and stronger than 10 yrs ago. Players are coming in ready to impact the game in a whole different way.
Just go back in look at the last previous drafts. OTs are coming out no less than 6'5-6'6. This is a new breed of players playing the position. "You'll never be able to find another 6'4 OT draft in the top 10 again". I gurantee it. High school prospects that come in being around 6'4 will most and certainty be convert into a Center or Guard in college. Jordan Gross is the last of the small OT you'll find in today NFL. Just look at the QB and WR position. The kind of QB everyone is dying for these days are that 6'5-6'6 QB (Cam); not every team has one but that's the type of QB a top5 team is looking to pick. Every GM wants that 6'3 receiver nowadays. Today's pass rushers are standing tall that you got to have these 6'5" up guys blocking them.
The top3 OTs: Jockel 6'6", Lewan 6'8", Fisher 6'8". This tell you exactly how the game has change in just a decade.