nine invited him along, happily. and ten lets mickey come along even though rose is very obviously against it because sarah jane wants him to. which is interesting. i also think that he might have let mickey come along to buy hiself time -- if rose has her real boyfriend on board (even if they've broken up, or aren't sure) then that's more time before he has to deal with the fact that rose wants the doctor to be her new boyfriend. argh that season is so fucked. he wants to romantically pair off mickey and rose because it's easier, but he still wants to be able to monopolise rose's attention and time whenever he feels like it.