Just when you think you understand it, it gets weird. Not sure if plot-hole but I just watched the episode 'Love and Monsters', the one with the Absorbaloff thingy and with the Agency 'Linda'.
Just a quick run through:
Elton sees 10th Doctor at the age of 3
Rose meets 9th Doctor at 19
Elton is older than Rose
Elton re-meets 10th Doctor while Rose is present
My question is, why is it that he didn't meet the 9th Doctor? This means that the tenth doctor came both before and after the 9th Doctor which makes no sense. Considering the age and the sequence of events, Elton should've met the 9th Doctor not the tenth. This is either a major plothole or there's something BIG that was brushed off. I'm assuming it's a plothole.