Avengers Thanos Storyline Continuity Question - MAJOR SPOILERS

I've loved the MCU storyline thus far and wigged out when I saw Thanos at the end of the first Avengers film, but I have a continuity question that has been bugging me. In the first Thor film, as sort of an easter egg, they showed the Infinity Gauntlet resting in Odin's vault. Now we see Thanos going after the gems. How is it that the gauntlet was in Odin's vault, yet the gems have apparently been apart all of this time and are being sought out? I hope they explain this somehow, otherwise it seems like a huge oversight. My friend has a bigger issue with it being right-handed than everything I just mentioned, but I got over that. Figured Odin's a righty while Thanos is a lefty (or vice versa).



BTW, I would absolutely love a film version of Thanos Quest (adapted to current storyline, of course).