Thiago really looked pretty bad against Kos but caught him with a "lucky punch" but his stand up looked pretty awful as i recall. Thiago has only knocked out one other guy & it was a TKO on a (knee injury) so stand up isn't really his game, he's known for his ground game.
Fitch has beaten good ground fighters (Gono, Diego, Carneiro, Fiorivanti, Larson) & has beaten stand up guys too (Burkman when he was good, Alves) & GSP couldn't finish him so I actually think that line is about right or just a touch low.
I was hoping for a -200 to -250 line for Fitch based on Thiago's win over Kos