Yes it seems plausible. But I'm going to correct you on one thing the Vex don't own the vault. They have control over the location in wich it can be found wich is a little different.
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Really? Source please?
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Yeah I think I jumped the gun I should have said I think instead of let me correct you. But if it belongs to then why would there be cabal in it as seen some of the videos?
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Wait, theres footage of the vault!?
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Here you can get some and of course of some other with some well good info. Destiny's Raids - Everything We Know!: http://youtu.be/bcMR7PNbysA
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Yes just some small ones also as it seems there is a part with platforms that turn invisible but I don't know how that works.