Might be forced in that situation to take Rieff. At least it would take care of the RT position.
If we can't get Tannehill then Reiff certainly would grade out the best. He's the number two tackle on the board behind Khalil, and he's a very good tackle at that. I would say his biggest attribute is his ability to play in a zone blocking scheme. Another good thing about Reiff is that if Jake Long ever got hurt again we would have a very good player to slide over and hold down the left side.
But whether or not we take Reiff depends on what our staff thinks of guys like John Jerry and Lydon Murtha. If they think Murtha and Jerry can handle the right side then I don't see us going after an offensive lineman until the 3rd or 4th round.
Who should we take if Tannehill isn't available, we should take the best player available that fits an area of need and right now outside of quarterback we need a WR "Z" Type, DE/OLB Pass Rusher, RT, SS, RG, and a TE Vertical Threat. So going with that in mind I think these players would be good fits if Tannehill is off the board:
Ingram or Coples
I think that any one of those players would be an instant starter that could contribute right away and be a very good player for a long time. While they won't have the impact that a potential franchise quarterback would, they do bring solid talent to their respective positions. The only guys that scare me are Ingram and Coples. I just think the other guys are safer picks. If I had to choose between Ingram and Coples I'd probably take Ingram, I just like his versatility more. Moving him from 4-3 DE to 3-4 OLB would be much more fluid. Pairing him up with Wake would give our linebacking corps a great deal of versatility because both guys can pass rush and both guys are equally good going after the quarterback whether they're standing up or have their hand in the dirt. If we're going to go defense I really like Barron or Ingram in that order. If we're going offense then I like Reiff, Floyd, and DeCastro in that order.