(gosh! you have 4 italian players in your roster!!

)
The analysis of Kwaiwah is well developed and quite deep.
Let me add a couple of comments.
1) in terms of salary, I would estimate about 130K$ next season (uneasy to say as tools are not reflecting recent adjustments)
2) the increase in salary per ID/IS pop can be estimated around 15K$ :O
3) this player can be trained on his secondaries (guards' are almost non influent on salary)
Options:
1) 1v1 for forwards: pros - you can train in PF position, player in natural PF role; cons - it increases IS so... rate is about 2-3 weeks on HN/DR (not so critical but useful) and 4-5 weeks JS/IS (not great news, one pop in IS every 2 in HN/DR on average)
2) JS for SG/SF: pros - JS every 2/3 weeks; JR/IS every 7/8 ; cons: no pops on HN/DR (as far as I remember); player forced in SF position (suitable at two conditions: first, you attack with LI; second, your opponent does NOT have a SF with high JS)
Other "creative options" are about 1v1 or JS for Guards, that would push your player on a wrong spot. You can do that only playing against poor opponents. I would discourage training on OD, unless you have a lot of patience (age+height).
Moreover, you should also consider other trainees: how will you develop them? What they need? As ground rule, I don't want to sacrifice the team to one single player - unless you'll train Guards, in this case that would be good.
Let me add that you need a lot of training on Stamina and FT's! One pop in ST is minimum (afterwards it would be nice to have), several in FT's would be relevant to your team's performance (I expect him to gain fouls).
If this player would be mine, I would consider these options, under condition that 130K$ is still affordable:
1) I want to keep him
next two seasons: choose the training program to minimize IS pops the first season (JS for G/SF wherever possible, lost matches, or against bots or poor opponents) + FT/ST + 1v1 for FW only when critical. This will bring you to 150-160K end of the season (!), then push on the second season on all primaries (JS for forwards) and take your 3.5M$ stake.
2) I want to
keep him one season: JS for forwards, sell at 3M$ (prices are estimated, they should be double checked with fair market value, and you know: "it depends"...)
3) you can keep all lifelong: you must jump to I series and dramatically increase incomes. And follow plan 1.