I listened to the bootcamp recordings.
Hannah and Relley are both good singers, a bit old fashioned. And kinda alike, so only one of them is making it to the live shows. Probably Hannah, but what do I know.
Abi's "I Wanna Dance With Somebody" cover didn't impress me much. Old trick. The weakest voice of the 6 girls that made it out of the bootcamp, IMO.
Melanie isn't a vocal powerhouse either, but her voice is clearer. Between her and Jade, I think one of the come back girls will likely make it to the live shows. Two would be too much, it would look bad if two previous rejects made it to the lives in the same year. Based on the audition edit, Melanie. I never got the hype around Jade's audition two years ago and Kelly was absolutely right to ditch her at the judges' houses that year. We could make a case that Sophie Habibis' spot could go to Melanie that year.
Tamera is the commercial package. Unless TPTB decide she is too controversial, she is probably a lock for the lives. I mean, if Cher Lloyd and Katie Waissel both made it in the same year after botched judges' houses performances, how could Tamera miss out?