Sounds like he has a big frame which is great! I would say that no, it's not too late at all - might work to his advantage that it is the first time he's showcased and he is in the high 80s. I'm assuming he is a RHP? Even if so, I don't think he needs to be consistently over 90 as a Junior to showcase but others may disagree. There's still time, but for mid to lower DI he needs to be seen this summer?? Best of luck!