Among the opposing representations, 15 proposed alternative arrangements including pairing Blaenau Gwent and Rhymney with Torfaen and pairing Caerphilly with Newport West and Islwyn.
Ymhlith y cynrychiolaethau yn erbyn y cynnig, cynigiodd 15 drefniadau amgen gan gynnwys paru Blaenau Gwent a Rhymni â Thorfaen a pharu Caerffili â Gorllewin Casnewydd ac Islwyn.