Trayvon likes the fastball middle-out and seems to be waiting on it and hitting it up the middle. The bad part is hes whiffing at anything offspeed despite hitting-up-the-middle (which should technically give him more time to react) and doesn't seem to have good pitch recognition or patience yet.
This approach adds to reaction time because the perceptive speed of the fastball away is considerably slower than that of the inside or high fastball and by hitting middle-out he is adding an extra split-second to further react. Despite the added waiting time with this approach hecan't seem to recognize offspeed or avoid hitting balls. The league will adjust throwing hard in and offspeed away.
I agree they're going to approach him LH this way (and that I would), but I'm not really sure how he'll respond yet. He's not an oppo guy as a RH batter, as far as I can tell. When I've seen him RH (minors and bigs) he's a pull RH hitter and an oppo LH hitter. I wonder if he's left-eye dominant to a large degree so he has to wait longer as a lefty since in that stance his right-eye has to carry the load.
If he is, then the proper attack plan may be to throw outside to him as a righty and inside as a lefty. If he's NOT...then it's just a matter of approach, and there's already evidence from his RH stroke that he's capable of pulling a ball even with that long stick and his swing the way it is.
Most young players struggle hitting off-speed. I'm willing to watch him work through the process and see if he can come out the other side as a plus hitter.
~G