SG also has JR to single position train so to be fair they gave OD to PG.
Fair? While I'm not really bothered by it, the reason only PG can single position train Pressure certainly couldn't be out of some attempt to be "fair" in comparison to SGs. PG can single position train in three things (Pressure, Passing & Ball Handling) while a SG can single position train only in Outside Shooting. Of course SF & PF can't single position train in anything, and Cs have it as good as PGs, with three options for single position training (Inside Scoring, Inside Defense & Shot Blocking).
If anything, I think it would be somewhat interesting if each position had at least one thing they were able to single position train. And with no overlaps - so even PG and C would need to train out of position for some single position training. Right now single position training really forces a focus on playing guys out of position at either PG or C - or developing players at those positions. Easy enough to split the three for a C between C and PF; not certain which would be the best to give to SF. I guess it would either need to be one of the three a PG currently has or take one of the three from Cs. Something like this:
PG = Passing & Pressure
SG = Outside Shooting
SF = Ball Handling?
PF = Inside Scoring
C = Inside Defense & Shot Blocking
Not really sold on the best SF option, but another possibility would be that SF doesn't have single position training at all, but split the guard areas equally between PG & SG by moving Pressure to SG for single position training.