The most trainees I would advise you to get are 3, if you are single-position training. Even then, you might just want to stick with 2, as getting 3 guys 48+ for 1-position training can be a pain in the butt.
The first guy is looking good, and I would give him another pop in OD and PA, before moving onto his HA and DR. The second guy really needs 1v1 Guards, so he might benefit due to the elastic effect if and when you train it.