Elma went much too far in telling him to leave but I expect she would have given Scott a genuine apology the next day if he hadn't left. I can understand her knee jerk reaction but Tina was the only logical choice to keep in. Kaz and Montell were a couple already so it wouldn't have made sense to separate them by keeping Kaz, Nas had no interest in anyone. Scott hadn't promised anyone anything re Tina.
I think the Crux was it was awkward for Scott as he's 36. Too old for kissing challenges and suchlike. When he came in there was Marcel and India so a selection of later 30s contestants, now the age group seems far lower. I just think he'd had enough, little to do with Elma.
I think Allstars could be really interesting but it ideally needs to develop to reflect the maturity and go into the life experience of the participants, not just ape the original format. Bit more Big Brother would be good.