Probably not. Starting pitching is only one way - and clearly the most expensive way - to win.
Look at this years top teams. Tampa has maybe 3 actual SP (4 if Rasmussen is healthy). They certainly have one guy (McClanahan) everyone would call an ace.. They use starters and bullpen arms a lot. Baltimore has no pitcher anyone would call an ace, and probably no SP most would consider a #2. Texas went out and bought an ace. He’s out for the year. But are getting by with other acquisitions and a ridiculously good defense.
These are the best teams. Two have aces. All 3 have great defense, which is their common thread…