JKSManga
It's Vincent remember Quinn had curly hair at first so as a clone of him Vincent also has that hair. Also the other energy must be the nest crystal. Though hats off to him remember Vincent basically lost the will to live after losing Kate but he waited a 1000 years to help Quinn which is really touching. However now it makes me think remember that Vincent had that girl feed him grapes if all the rumours weren't from Fex just what has Vincent been up to. I can't wait to see what he does it is nice that Vincent has been hiding in the shadows helping out all this time.
Either Vincent or Sam. My money is on Vincent because he has a nest crystal giving him energy and keeping him alive. Sam was a vampire created by one of Quinn's bloodline during or after an attack by pure and then the blade family just before the demon tier crystal hunt. Had it been Sam he would be suffering the extreme age issues Fex suffered unless he learned how to use qi too and I don't remember Quinn teaching Sam how to use Qi.
Vincent was always shady. There was/is the possibility that he always knew about the experiments that made the Dalki and that Jim was working on his behest when he made them! That would mean that Vincent always knew he wasn't going to die and he would be transferred along with his ability. But this is all unlikely.