WHA!? You bought a superior trainer only for 215k? I know that during this time the trainers are sold cheap but I didn't expect them to be sold this cheap...I bought 15.5k trainer 2 weeks ago for 312k...I should have waited a little more :P
But remember that the difference between lvl 4 and lvl 5 trainer is not very large. People say that the lvl 5 trainer gives you extra 2-3 pops over the course of 2 seasons. But ofc depending on the sublevels, I'm sure it can give extra 4-5 pops.
Now your player. He's improved compared to the beginning of this season. Are you planning to make him a well balanced SF or outside oriented SF or inside oriented SF? It'll take quite a lot of time to make him into a well balanced SF, so I don't wecommend this option. plus his potential is allstar, so if you're thinking of training him for a long time, then you should focus on either outside or inside.
It will take about 6 weeks to reach 12 OD and probably 2 weeks to reach 9 ID. Whether you want to make him inside or outside oriented player is up to you. But if I were you, I'd probably go for outside cuz his height is not too bad for guards, and his guard skills are better (except his JR).
I hope you're considering to train his JR as well. Better to train that when he's young cuz it takes ages to train at older ages.
Btw this is my SF, who's on the U-21 NT. I'm eventually thinking of making him a SG, who can sometimes play as SF, when using outside focused tactics. Currently in U-21, he plays at SF position.
Jump Shot: sensational Jump Range: strong
Outside Def.: sensational Handling: respectable
Driving: proficient Passing: average
Inside Shot: respectable Inside Def.: strong
Rebounding: average Shot Blocking: average
Stamina: strong Free Throw: strong
He's turning 21 next season, so it'll be a pain to train his JR...i got him as my draftee when I didn't know how the training worked, so i wasted half a season of training. But he's come a long way and he's not doing that bad.