It's clearer than that. In comparing outside bigs to inside guards, the only thing that matters as a trainer is the amount of out of position training.
A top inside guard needs to play out of position to get IS. I would focus some off position training for PA and maybe some JR. I would not expect to have much more out of position training for the big compared to the guard. Ideally, you'd improve other off position skills but these standout as the most important.
Everything else can be done within the player's long term position. The number of skills to be trained is unimportant to me. Good players train into their prime no matter the build. Good outside bigs can be built, it just hasn't been done on a mass scale yet.
An improvement to 2-3, by way of a SB change, is a decent idea assuming its calibrated properly. Either way, I wish I hadn't started a long 15 season rebuilding plan as a LI team that's coming into its prime and finishing training head on with a change that is meant to limit its effectiveness.
"Well, no ones gonna top that." - http://tinyurl.com/noigttt