Allison, Romber, Jeff & Jordan, Ethan & Jenna, Brenchel and reluctantly enough, even Cody & Jessica being cast on TAR were okay because they had seasons between them. (With the exception of 19/20 of course). Rob & Amber and Brendon & Rachel may have been stunt casting, but I think both did earn their All-Star status.
But now, it's understandable for anyone to be weary of the possibility of having a BB team on TAR32 (and even 33) when TAR31 has three and of course TAR30 was won by a BB team.