Mentally twisted I don't think so. Everything he did was calculated risk and he was a village first kind of guy. The Uchiha have to undergo a lot of mental stress/trauma to reach their potential and that's what itachi did for sasuke.
I would definitely like to see an older trunks and goten . They have been around since the beginning of the buu arc with no real development. They should just do another time skip like every other arc and go from there.