Alistair, Spong, Schilling, Cyril, Schilt, Saki, Sefo and a few other ones to choose from. Most of them looked a lot worse striking in MMA, but then there's primes and such as well. Schilling and Saki for instance were both pretty much past their prime when they transitioned. Obviously then there's Hunt, Cro Cop and Mousasi who have been fighting MMA for so long that they would probably classify as MMA fighters before Kickboxers. You could add Alistair there as well.