To answer your question about the minutes, my guess would be that his GS would drop one level, unless his current GS is at the high end of strong (You can guesstimate his sublevel by his DMI). I do not think that GS training is a waste of time if you are A) not currently developing prospects,
![B)](/images/conf/emoticons/smug.png)
trying to win all your games, and/or C) trying to save money by hiring a level 1 coach. The coach level makes no difference when training GS so you can save a bundle and have a team that is going to perform very well. You can also alternate with FT shooting to improve that as well.
Good luck.
Once I scored a basket that still makes me laugh.