Loomis Appears to be Trying to Prove that He Can Win a Championship Without Payton and Brees

Because he thinks the DA experiment can work.

Exactly. So it's not about his ego or wanting to get the credit. He legitimately thought that DA could win. I think he is tragically wrong about that, but I also think that if DA doesn't win 7 or 8 games this year Loomis is going to fire him.

If he doesn't then Loomis has clearly lost his judgment and needs to go too.