I would love to be a fly on the wall when MM and TD talk to McNally about what the options are. I'm sure there is a plan A, B, C, D and E on the table for the OL.
Shelton represents only 1 of those options, and he could be anywhere from option A to option E in the minds of the brain trust.
Having said this, I see some value in filling a hole early on in the FA period. I would offer a low round pick (6-7) in addition to TH but nothing more. I suspect TH's stock is falling with the draft approaching.