Yo Scott.
There are friends and there are people you play music with,sometimes it gets to be both. I'm all for encouraging anyone to learn an instrument and be creative,kudos to you for bringing them on,however the will to flourish and stand alone can only come from the individual.
It's my belief if someone wants to use music to be creative,that's what they'll be driven to do,you can't make it happen just because they are a mate.