First off chilllllllll. Every skill has secondary skills it trains. In reality if you are a BAMF at JS then more than likely you dont suck at free throws. So why do players with a high skill set of JS and IS can literally blow at FT. This game should and is pretty realistic.
You are quite a lot of fun, I would say:) No one is "unchilled". This is really an interesting way to promote your idea, saying that the other party is trying to virtually snap at you and continuing with your idea regardless of their opinion. However...
On-topic: He was right, you have the FT training, so use it. You don't want to? then why complain. Of course it would make sense to make JS and FT correlated, however right now FT is team-training, which means it's really really worth it. If you played this game long enough, you would see that after 4-5-6 seasons of training and let's say 10-12 weeks of FT training you had quite a lot of good FT shooters on your team. Considering you are not a day-trader and you have a core group of players.