Another point I falied to mention was that I was training IS for ~3-4 weeks before switching to RB. Of the 3 players I've been training in RB that haven't popped in IS, two of them have an extra week of IS training since their last skill increase. Next week (still training RB C/PF), I'm expecting pops in ID for nearly all of my of my trainees, and I also expect 2 of them to pop in IS. I only expect one pop in RB ;)