Kattar starts slow. If he can overcome some early adversity and make it a grind on Giga with pressure and wrestling, I think he's got a real shot to win this fight. If he'll wrestle is anyone's guess and Giga has looked average when facing grappling pressure. If Kattar fights a one note fight, he's playing right into Giga's hands.
Like I said a few days ago in another thread, we will know a lot more about Giga on Saturday night. Until then, it's all speculation that'll turn into "I told you so" type posts if the guesses come to fruition.