[Q] ReRoot: Non official update but custom 4.4.4 topic

Just researching converting back to factory. Thought Odin would be straight forward, and maybe it still is. But read something that scared the bejeebees out of me. Something about not converting back from 4.3 to 4.1 or something like that = brick. Now, I am assuming they do mean the Official OTA 4.3 update and assuming that my updates have always been from custom roms since 4.1 and are not going to affect returning to stock = brick. IS THIS TRUE?
Second question, I am looking for the Verizon download for the latest firmware available now.
Third, is Odin still the best choice to return to root?