Because we invested a year developing Massey, Potter and Kelemete and, while we may like their progress can't be sure these are the guys we'll want to go to war with over the next 5 - 7 years, I'd guess we might want to evaluate these 3 guys plus any we might draft for their versatility as interchangeable parts on our O-line.
Depending on whether or not Massey and Potter could move inside (or Kele outside) if there are 2 or 3 tackles available at 7 (& they're rated fairly equal) we may want to draft the one who's most versatile.
And not just position-versatile; it would be nice if we could develop/draft at least one all-purpose guy who could pass protect, pull, block in space and-road grade. That's what I'll be looking for between now and Draft Day. Right now, I don't know enough about O-line prospects to make that determination.