Here's the ponytail from behind. I've done my best to hide v5's face here because, umm... I loaded up Genesis with Mr Hyde's texture as I was doing Abominable, and she looks kinda craggy with that skin!

 

you can clearly see where the head and neck sections are parting company :(

 

...and it's examples like this that I think would make for a great compatability chart - I'd put this under "has problems but can be used as long as you avoid seeing back of head".

 

Whereas others which suffer from the same technical problem I wouldn't recommend, as they're just unuseable (IMHO) on characters other than perhaps the base Genesis ones.