Mem, 8-dan - new KGS star!

Mem, 8-dan is new undefeated KGS player. He started on June,8  with the game vs 6-kyu, so Mem's starting rank became "5kyu?" After that he won 10 games straight and reached 8-dan.
I checked some of his games and I think, that he is close to pro level. What is your opinion? Which stable rank will he finally get on KGS?

About the game: Black's cut at 63 was an overplay. White not only saved his group, but also got a lot of points here.