I find it interesting and hilarious that lots of people say "He didnt deserve the seat" or "That should have been reserved for DM or Paid J". I 99.999999999999999999999999999999% guarantee folks who say that would be on here complaining in the exact same situation because they didnt get the seat.
Who cares if it was the last seat? His buddy called and got it for him. During IRROP or any situation is DL supposed to "reserve" seats on the off chance someone will call asking for the same change? How about the fact that this guy was proactive he got the seat? It should go to who has the most fortitude in getting it, and if you chose to "hope" DL would change it right or didnt call/tweet right away then its you snooze you lose.