They are worth training, but a word of caution: The 6'7" guy will train slower in guard skills due to his height. You can try and train him to be a formidable player, or get a few pops on him and sell. The MVP guy has a better shot at being a good player if trained well.
Training Program
OD to 9
PA to 8 (depending on if you want PG, 9 might be better)
1v1 to get HA and DR to 8
JS to 8 during 2-game weeks, offseason and weeks where he doesn't get at least 43 minutes in single-position trained skills. (The best total is 48-60 minutes a week.)
If you want to train JR, get them to 7 or 8.
From then on, you can decide what type of build you would want for both.