Collins is not a tackle prospect. Even before the draft when he was thought to be a first round pick, it was as a guard, not tackle. He's a power guy who struggles most in pass protection. Free is not a bum or liability just because he's not in Smith's league. This line isn't running and pass protecting in spite of Free; he's part of it.
Leary will not be resigned. Collins is the future at LG. Green is the future at RT. Seems clear to me. Collins and Green are both two years away from a payday. That's critical to improving this defense. You cannot pay everyone.