I don't know if this was posted already, but many (myself included) were WTF with Henderson coming in on a goal line play.

During the Coach McVay show he indicated that multiple players needed an IV during the game due to heat.

JB Long asked if that effected the "goal to go" play and Coach says yes - they were looking for Malcolm (I guess Gurley was not available) and he had not returned from his IV.

That explained why it was DH and not MB in on that play.