Well that's just absurd
That would be the safe way of doing things. My mistake was running TitanRelocker before downgrading the Radio and ROM.
I think the proper procedure for downgrading the XV6800 back to stock would be to install TitanUnlocker to put you back to an unlocked SPL. Your Titan would most likely not boot at this point because the SPL is not designed for the GPS ROM's. You would then boot into bootloader mode and downgrade the radio and ROM. The Titan should boot back to Windows at which point you should be able to run TitanRelocker.
It's all theory right now since I am not about to try this on my new XV6800. But it would be really nice to have a Stock VZW ROM laying around just in case