Well, I'll check back on the Rooker situation in a few months and see how he's doing. I just find it hard to believe that 80 PAs is all it takes for a hitter to become the next ABW.
I was mainly referring to Trout's subpar 135 PAs in his rookie year, though now looking at the game log, it seemed it was the tail end of those 135 PAs where he didn't hit as well and not as much the first 80, so perhaps that wasn't the best comparison.
Definitely. I'm not saying Rooker is ABW, but in my judgement he's a little closer now than he was at the end of last season. (And in fairness, the original poster said he was "rapidly becoming a non prospect" rather than he was already a non prospect. I too think that's a little strong, but I think some concern is valid.)
A player can struggle while still showing progress or a good approach. Trout's rookie season is a great example of that -- only a 87 wRC+ (although that's basically Buxton's production the last two seasons), but Trout showed good power and very reasonable K/BB rates. The biggest negative was a .247 BABIP, which you'd expect to correct itself. All that around his 20th birthday, and in MLB.
Rooker's problem, although it's still a small sample, is that he has really shown nothing this year. Could just be a slump -- he started slow in Ft. Myers last year too -- but that zero walks thing is just weird, and it's hard to explain. Makes me wonder what is going on there, and if this guy is going to have the capacity to make the necessary adjustments to be a plus hitter at higher levels.