Think about this a moment: Interceptors are made by the Cabal, right? Cabal are 800 pounds and basically gigantic space turtles. So why are the seats to their interceptors the exact fit for a guardian and not a legionary?
Thanks for the help guys, really appreciate it. So apparently, for all who care, the interceptors are driven by psions and that's why psions often hang around their spawn locations.
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From what I can gather, the pilots of vehicles/engineers are the Psions. They are small and nimble and are usually found near any of the Cabal vehicles. Also if I remember correctly something along those lines is said in the Grimiore. Hope this helps.