Well I had a quick look at your team. You have 3 potential trainees an 18 year old MVP PG, an 18 year old allstar PG and maybe the 20 year old superstar SG. They all look to have fairly low starting skills. If that was all you had you would definately do single position training for PG. However if you pick up some good draft picks and maybe buy one or two guys in the next week or two you can still do two position but those guys you have may benefit most from one position as they will be 19/21 and are already far behind in their skills possibly making their great potential of no value.