You do need 10 starters to start the year. Not all on the 40 man roster. But 10. That’s counting MiLB depth, emergency, etc. Teams will use more. But they need to know their first 10.
So if Sale, Paxton, Whitlock, Bello, Pivetta are the top 5 (for now) and Winckowski and Crawford are still around, that leaves 3 spots left. Mata, already on the 40, likely has one. Two openings. If everyone is healthy (not likely), only one would be on the 40 man roster…