Board Thread:Manga Discussion/@comment-71.52.75.8-20130914192419/@comment-190.87.180.176-20130916062537

Good question, I couldn't say it was because Jonathan's corpse. Dio cut (Jonathan's) "his" hand to revive Vanilla Ice. Though, remember that Dio had just absorbed Joseph's blood, so the vampiric infection wasn't at its full yet. Even with Joseph's blood it wasn't enough, Dio even said that after killing Jotaro he would suck his blood too so he could complete the fusion with Jonathan's body.

I think Dio wasn't planning to fuse his head to the body, but the body to the head. Meaning that he mostly had Joestar blood. Although that still doesn't explain how Vanilla Ice got to be a vampire with Joestar blood. Unless Dio can control his own blood, or after dying the vampire blood vanished.