When I increase the range of players a bit to increase sample size these number indeed seem more realistic.
Except that with IS training I believe the JS pop is a bit quicker than 52 weeks and closer to 25 weeks. And the IS pop is closer to 4 weeks than 5 weeks.
With 1on1 the pop on IS might be just a little bit faster as well.
@HeadlessTGunner: Your numbers seemed fine as well but mostly wrote this because I think the 52 weeks for the JS pop is a bit too extreme.
Crunchy! If you eat fast enough