He didn't get bull-rushed in preseason.
He'll be 25 in a month, he's no rookie. McGinn agrees with you that he needs more strength/bulk. At 25, you're not gonna get a complete makeover. Sure PS is ideal, but an LT prospect may get signed to a roster.
If his feet are excellent, and you don't want to lose the guy, maybe you have to live with his shortcomings. It's not like other options for tackle backup are flawless. Fish or cut bait; if he's a strong LT prospect, he's worth carrying on inactive list. He can play catch with Hundley.