You're right. I should have said if the Jags get the ball at the Denver 42. My point is that you trust your defense to make a stop against an offense that you know will likely run the ball 3 times. I don't care if their defense has been shredded all game. This is a different situation and we know they'll be dealing with a conservative Jags offense. Why put the entire game on the line on one play with 4 mins left in the game?
I don't think anyone brought this up, but is punting from your own 9 give you the same amount of room as typical punt formation? You probably need about 15 yards. Nevertheless, 15 yards would put the kicker in the endzone... about 6 or 7 yards deep.
If you assume a 42 yard gross punt average, that means the ball is going to be caught on DEN 35. If there's any return, and a net average of about 38 yards are not out of the ordinary, then JAC has the ball on the 30 or 31 yard line.
Maybe I've got my facts wrong, but I don't know how the ball even gets to the DEN 42 yard line. It seems clear that JAC would be in field goal position
immediately, which would in turn cost DEN the game.