OT Coin Toss = 49'ers Demise?

You don't want to defer, you want to choose Defense first. If you defer, you give the other team the choice and they will use their choice to choose Defense first and you'll be stuck getting the ball first.
Yeah, I meant defer playing offense. Not deferring winning coin toss because that wouldn't make any sense.

But yeah, just saying you want to play defense first is simpler.