User blog comment:IamJakuhoRaikoben/Chapter 420: Lamia Scale's Thanksgiving, Review./@comment-4449950-20150217022256/@comment-96.255.231.61-20150217055338

She's definitely not going to be with Crime Sorciere. No way Jellal's letting her join after that last monologue of his.

It's not so much that people want Erza to join Mermaid Heel as it is it makes sense she'd join Mermaid Heel. Much like it makes sense that Wendy and Charle joined Lamia Scale because Chelia was there; Mermaid Heel has Kagura and Milliana, the two people other than Jellal that Erza's close to outside the guild. Plus Kagura would make for a good sparing partner/training dummy. So it would be unsurprising for Erza to be found there.