they have chemistry! i still can never get over the scene where mickey and rose are walking in opposite directions, and mickey calls out "it'll never be me, will it?" and the doctor DOESN'T go after him. the doctor always goes to the people in pain, the people who need help. that's who he is.

the nice thing about ten having all these gaps in his story for the specials is we can envision all sorts of adventures that the doctor and mickey might have had together, since obvs the doctor invites mickey to travel with him after they foil an alien invasion together by combining their leet skills. or after the doctor asks mickey to hack into torchwood so he can send them prank emails on their secure accounts.