GAIII will definitely sign an as UDFA. He'll have his choice of teams.
I think TJ could go earlier, but I agree with Shembo and Jackson (and I think he'll go).
GAIII will not even make a team. There are PLENTY of RBs out there who will get a look long before GAIII does.
If all you can do is return kicks then you won't be given a look at all in comparison to other RBs who will do the dirty work on ST, are coachable (HOW long did they tell GAIII to lower his pad level and generate power to make sure he was the one doing the damage and not the other way around??? Three years? Maybe all through HS?), block and catch passes.
GAIII does NONE of those things well except KR and that is debatable honestly.