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So what everytime Sora is not busy fighting Heartless between the end of KH and CoM Roxas was apparently picking up the slack?Whenever you see Roxas he is wielding Sora's Keyblade. When he dual wields he is using Sora's and Ven's Keyblade. Sora also, obviously was using his own Keyblade as well. There are parts in the story where, yes, they are both wielding the same Keyblade simultaneously.
I guess? The alternative would be that they're able to summon the same weapon in different places simultaneously. Really though, what's some broken physics and weird logic to a magic fantasy sword?
The way I see it is that since Roxas was basically the product of Sora being split in two, the keyblade, being bound to Sora was split as well or perhaps replicated. Though this doesn't quite add up still.