Is that even possible, to train a 6'4 guy in inside skills? As short as that is compared to 6'7 or 6'8? It he can improve than i'll train shorter players in inside skills.
I just did three weeks of inside training for my guards. One week 1-1 f, two weeks inside shot. Everyone got a pop at IS, and they're 6'0, 6'1, and 6'5, but who knows what their starting sublevels were. I don't know that Nikola is going to get that much out of inside training, but then again, an improvement from pitiful to awful is more useful than an improvement from prominent to prolific. Also, you will probably want to shoot for better than "average" on Evrim, though that can probably happen after the other two are done training.