At 10 seconds, a WR comes slowly jogging onto the field, but the opposition doesn't know who he's going to tap.

Is it going to be the RB, leaving the team in an empty backfield? Or is it going to be the in-line jumbo blocking TE?

Remember, the offense just has to start at 10 seconds. So then the WR taps the jumbo TE at 5 seconds and now the defense needs to consider, react and make an appropriate sub in...0 seconds. Meanwhile the jumbo TE books it off the field and the offense snaps the ball with two seconds and the defense either misaligned or frantically trying to sub