Stewart projects for 2 pitches that grade 60-70 with good athleticism and a projectable frame. His fastball was in the low 90s late in the spring rather than mid 90s earlier in the year, so hopefully he can find that extra velocity again as he fills out. The athleticism is usually a good sign the pitcher will be able to add a change and repeat his delivery well enough to have average or better command. He is basically a Touki clone with better command projection, so wherever you rank Touki is 1-2 spots away from where you should rank Stewart.
Jenista literally grades out almost identically to Riley offensively (from the left side of the plate) with more straight line speed and less arm. He is obviously less advanced than Riley at this point, and there are some rumblings that he can't handle the OF. I'm guessing he is going to prove adequate in LF, and would place him somewhere in the Braves Top 15-20, just behind Waters and the catchers.
Beck is a SP with a back injury in his history who has a chance to be a back end SP if everything bounces back. I don't like reports of straight fastballs in the low 90s from guys who are about to turn 22, so I'm not super hopeful. I'd place him on the back end of the Braves Top 30.
Riley is a JC pitcher who saw his velocity increase this spring. If he is able to maintain it, he is a potential SP. I prefer him to Beck, and he likely slots in the Braves Top 25-30.
Moritz sounds like a AAAA OFer who could see time at the end of a MLB bench as a 4th/5th OFer.
The rest of the guys seem like org filler.
Without a 3rd round pick the Braves only really got 2 guys with a reasonable chance to contribute in a meaningful way at the MLB level. I think I would have rather seen them punt most of their picks after Stewart/Jenista in order to make a push for Rocker or Wilcox. If those guys really wanted $3M+ to skip college then they were never really an option anyways though.