There was no mention of anyone else regenerating, that was indeed Tempesta's special ability, he even mentioned about losing one of his bodies. I find it loosely similar to Basil Hawkins ability from one piece.
I think that we have been waiting long enough before seeing Natsu fight on the level of a S-Rank Wizard or even Higher. As I think he has messed around to much on the lower level and must be recognized as a higher Powerful Wizard, even though I think he still has not shown his Full Potential Yet.
May be my wish or speculation, but I think Natsu full Potential will only be reached once he either meets up with Igneel or before him something happens to Igneel to unlock his TRUE POTENTIAL, that may even surpass the Master of Fairy Fail and Gildarts.