Hey, look at that! Admiral Hackett is there, and just like in Mass Effect, he's not a dunce. Nice to see Sheridan isn't the only Earthforce officer who's not Styles. Besides which, if Hackett's smart he realizes that, if that is indeed Shepard, he can just watch what they do. They already clearly had intel Earthforce didn't, simply because they were there in time.

As for Lyta Alexander, I rather like the idea of Sheridan thinking she's obviously an undercover Psi Cop, all while Psi Corps thinks she's a mole for them...and what she really is only the Vorlons could say.

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Authors of our fates
Orchestrate our fall from grace
Poorest players on the stage
Our defiance drives us straight to the edge