Allen Bailey was a physical freak and has length that is probably in the 90th+ percentile of the NFL. He also had the versatility to literally play several spots on the DL if it boils down to it. SDE in 4-3, 1T, 3T, and 5T in a 3-4 if you asked him too. Jamarcus looks somewhat sawed off and closed to maxed out physically and is a 3T and not sure he could be effective in any other role. He is listed at 6'2 260 so he is probably 6'1 and will peak at 280-290 which screams 3T.
I don't think the Bailey comparison is a good comparison strictly from a physical standpoint. Bailey was a freak of nature, he played RB and LB in HS. Yeah it was against scrubs, but he still lined up and did it and dominated and didn't look out of place whatsoever. Chatman couldn't do that, lol.