Shouldn't there already be another Doctor in Pete's World? Pete's World was an alternate universe in which things were mostly the same with minor differences. It's where Rose and 'Metacrisis Doctor' end up.

So shouldn't there already be an alternate-universe Doctor in that universe? One who never met Rose (Pete and Jackie never had a kid in that universe), with his own Tardis? One wonders why he missed out on the massive crisis that was going on with Earth at the time!