Exactly! Going into last spring with 1 reliable starter was a disaster waiting to happen. Filling 2 rotation spots with rookies/injury recovery guys is a tall order. The O's were trying to fill 4 spots that way. It was a fool's bet to think that Felix and Harvey could fill rotation spots. No, Harvey wasn't the worst pickup, but he had to have a good 2nd half to get his ERA near 6. The Dodgers have about 10 starters that are better than any O's starter other than Means. They really benefitted from that depth this year. The way that pitchers get hurt, a major league club should never go into a season w/ less than 7 starters. I'm not included guys who had mediocre AA seasons or returning from major arm surgery or haven't had a good season in 5 years in that number. If you want to lose 110 games, then last year's starting rotation in the spring was a good was to do that.
Grayson is a great prospect and if he was going 6+ innings on a semi regular or regular basis (and still putting up dominant numbers) this past year, I think he really would have a chance to be ahead of Adley.
But I don’t think his case is nearly strong enough. Adley shouldn’t be ranked the #1 prospect in baseball imo but he is the #1 prospect on 29 teams, including the Os.