Ahh but what if your party killed a mob or 2 before they realised you had d/c. I think an easier solution would be just to make it so when you rejoin (leve-share) you still get the bonus that the rest of the party are getting. The system already know's how many links have been made so already knows what SP/EXP should be awarded to party members now it just need's to apply that to people who join mid leve, like in the case of when you d/c.

Can't do anything about the GA though I suppose but at least getting the links back would be better than nothing.