College bat vs. High School bat.
Although, we know college bats are usually a much safer bet than a high school bat. Still, Brentz was selected 36th in the 2010 draft and Casas was taken about 10 spots earlier as a high school bat. Brentz was heralded as a more safe offense-ready player and Casas is someone you can dream on. Well.........we all know how that worked out.
Any whooooo Casas is now 21 and although the sample size is pretty small he's handling AA pretty well (after a loss season), when Brentz was 21 he was .598 OPSing it in Low A. Brentz ended up putting some decent numbers up at the AAA level, but he was never able to take his game to the next level.
Brentz was an outfielder while Casas was a 1B, at 1B you have to hit, if he had played a premium position (such as SS) he might have been one of the first HS players taken in the 2018 draft. But, lets be fair here, there's till plenty of time for Casas to flame out, but I'd say there's more reason to be hopeful in his future than we ever had for Brentz at this point. I think the offense potential from Casas is more than it ever was from Brentz, and certainly so at this point, but as a corner infielder he's going to have to hit and hit well to be a regular. Interesting factoid, the kid threw mid 90's in HS, too bad, that arm will be wasted at 1B but if he reaches his potential with the bat who cares.