i don't think goku would really for training his sons anymore. he is too into uub. vegeta, he'll train trunks in a heartbeat. remember, goten is into girls(which ain't bad) and gohan is freaking smarter than most ppl(which isn't bad). imagine super buu(cause uub and fat buu combined) being trained to his full potential; hopefully uub won't turn his back on his mentor though.