Look, Tito has certainly not improved since he last fought in the UFC (against Lyoto), but his skillset has certainly not deteriorated to a gross extent, either. (His cardio is a different story).
He's still huge, very strong, and has a reliable if utterly predictable ground n pound game.
And he fights two weight divisions above Kosh. Kosh is certainly a top 5 welterweight, but there's no precedent of MMA fighters moving up two weight classes to defeat contenders.
Fighters who have moved up in weight to win fights have moved up ONE weight class, and these were top 5 P4P fighters in the world: BJ against Matt Hughes, Anderson Silva, and Randy Couture.