When Aaron returns full time it is a great opportunity to change the character. I'm not suggesting a big brain transplant, but a much more less bad tempered and more adult Aaron would be do him favours. Aaron doesn't need to be hampered with boyfriends, especially with the two ugly ones he got lumbered with last time. Jackson is in the best place, six foot under, and Ed had been dumped god knows where. It will be good to see him interact with characters he might not been associated with last time.
Could Ross end up being his best friend rather than that dimbat Adam?
It'll nice to see him in stories where is sexual orientation is not an issue and be treated like any other character on the show. It would be good to see him be dead nice to his Mum as well. The past is dead and buried.