My top 10 would look like this.
1. Casas
2. Mayer
3. Yorke
4. Bello
5. Duran
6. Groome
7. Jordan
8. Bleis
9. Wilkelman Gonzalez
10. Brandon Walter
Then in no real order to top out the top 20-25: Gilberto, Kutter, Downs, Mata, Binelas, Murphy, Song, Winckowski, Brainer, Lugo, Rafaela, Castellanos.
Pretty good depth. Out of that list, I could see Song, Lugo and Rafaela moving up the rankings a bit next year... but maybe not as there probably won't be very many graduates. Lugo and Rafaela both had solid 2nd halves they can build off. I also have an irrational (and well documented) like of Pedro Castellanos, who started to hit for power at the end of 2019 and carried it over in 2021.
I'm not very high on Gilberto or Downs but they both have potential. I don't think Gilberto will hit for enough power and I don't think Downs will make enough contact. I think Mata is a bit overrated due to his age and being a hold over of a poor system in prior years. His stuff has never translated to strikeouts.
Murphy has great stuff but I'm not sure he'll ever figure out how to control it. I'm not high on Winckowski but I like strikeouts and he's not a strikeout pitcher. I'm very high on Kutter Crawford. I think he was a completely different pitcher in 2021 than he had been the rest of his career and showed far more control than pre TJ. His overall numbers are also bogged down by 2 awful back to back starts. While you can't just ignore those starts, given they were his 4th and 5th start at a new level. He pitched in the DoWL this offseason, compiling a 0.42 ERA in 21.1 ip, 15 hits, 3r/1er, 1 HRA, 8bb/23k.
Binelas I don't really know enough about to comment but I can't really keep him off the list.
As for the top 10, the first 3 are pretty standard choices. 4th, maybe not so much. I've been pushing Bello forever on this board and suggested in April or May that scouting reports were lagging behind on him mightily. It looks like they've caught up some. Bello is a huge binky of mine and I've been following his progress closely for some time. I think he sticks as a starter.
Duran at 5 is pretty standard. His debut was a bit worrisome with the 4bb/40k in 112 PA being the most glaring. I think if Groome didn't have the history, I'd might rank him as high as 4th. Scouts are all over the place on his stuff this year, though reports were more positive at years end. After a rocky start, he settled down nicely and was mowing hitters down in Portland to end the season.
Jordan at 7 is standardish. He had a good debut with the bat we'll need to see what he can do with a full season.
I'm high on Bleis at 8. I think he's going to fill out and be a very well rounded player with no real weakness to his game.
I'm somewhat high on Wilkelman at 9. I love his arm and he's flashed 2 plus pitches and an average one. He needs to build up arm strength to maintain velocity deeper in games, but even later in games, he sits at 93-95. He doesn't turn 20 until later this month (3/25). He'll probably start the year in Salem (he ended it there in 2021) which is pretty remarkable considering 2020 was a washed year. But now that I think about it, I just haven't fully adjusted to the smaller minor leagues.
I'm with Law on Walter. I love what I saw this year. His ERA is also incredibly misleading. He has 2 terrible starts where he combined for 7.2 ip, 17 hits, 17r/15er, 3bb/12k, 4 HRA. Outside of that, he was just nasty. 81.2 ip, 50 hits, 25r/14er, 17bb/120k, 0.89 WHIP, 37.4% K rate, 5.0% BB rate, 1.54 era.
I'm sure I missed someone but that's ok. I didn't forget the Connor's, though maybe I should have Seabold in there somewhere. He has compelling stuff.
Anyway, TL;DR: Nice to have a farm system again.