OK, well maybe not 'most', but many.
He can't go through the lineup more than twice, and often not more than once without getting lit up, and he can't hold his velocity throughout the season let alone throughout a game.
The Twins don't need #4-5 starters either; they need #1-3 starters and they need late inning relievers, because that's what they can't afford on the free agent market.