Two players may be in motion BEFORE the snap.

You cannot “Defer” on the overtime coin toss in the regular season. There is no 2nd half kickoff in overtime to defer to. From what you describe, it sounds like they elected to a defend a particular goal. Choosing which direction you want to go is not deferring your option — it's exercising one of the options you have.

Well, one thing that has actually NEVER (not hyperbole) happened in the history of NFL regular season overtime is "deferring" on the coin toss. Deferring is not an option since in the regular season there is 2nd half kickoff in overtime. Electing to "kick" is not deferring.