Ksand are you out there? What's your view?
I'm here.
I'm not sure, to be honest.
Annex FM 1.7 doesn't specify whether the bank statements for employment income have to be ONLY in the sponsor's name, although that's what it implies (the partner, or the partner and applicant jointly), while it says that for cash savings, the funds have to be
under the control of the sponsor and/or the applicant.
However, Appendix FM-SE does say that all bank statements (whether for employment income or cash savings) can ONLY be in the name of the sponsor and/or the applicant.
My gut feeling is that they will have to get the bank account in the name of the sponsor only and if they can't get the last 6 months of statements back-dated with only his name on them, they may have to wait another 6 months before they can apply.
I guess the question is whether the OP is willing to take the risk of applying with the current statements, and hope that this is sufficient even with the ex-wife's name on them, or if they feel safer waiting and applying when they have 6 months of statements with just his name on them.