star wars - Was Admiral Ozzel a Rebel agent or just incompetent?

I was re-watching The Empire Strikes back this afternoon and there is the scene where Ozzel and Piett are arguing over the data sent by the Hoth probe droid. Ozzel is insistent that this isn't Rebel activity. He then continues to argue it with Darth Vader when the Sith lord joins the conversation. Finally, after losing the argument, he then makes the most incompetent approach to Hoth, providing the Rebels with enough warning to allow most of them to escape the planet.

From a logic standpoint, it seems unlikely that someone who was that completely incompetent and that poor a strategist could have risen to the rank of Admiral. It seems to me that a reasonable alternate theory is that Admiral Ozzel is actually a Rebel agent (or sympathizer) who competently made his way to the rank of Admiral, then used that position to try and divert Imperial forces away from Rebel bases. And that, failing that, he risked death (and received it) to try and save as many Rebels as possible.

I know nothing in the movies supports this, but is there anything in either other canon or Legends that would support such a theory?

Answer

Various canon source (such as Ultimate Star Wars indicates that he's simply incompetent at his job. There's no suggestion whatsoever that he was in league with the Rebellion.

Admiral Kendal Ozzel commands Darth Vader's flagship, the Executor. Ozzel displays poor judgement; first doubting evidence of life on Hoth, and then failing in a bid to surprise the rebels there.

_{^{Ultimate Star Wars - Admiral Ozzel}}

and from the canon junior novelisation, we have Ozzel's internal thought process. He feels that Piett is simply being over-enthusiastic about a very small find.

“I think we’ve got something,” Captain Piett is saying. “The report is only a fragment from a probe droid in the Hoth system, but it’s the best lead we’ve had.”

Admiral Ozzel shrugs off his captain. Piett is entirely too enthusiastic, in Ozzel’s opinion. As if every sentence he utters might prove sufficient for a promotion. “We have thousands of probe droids searching the galaxy, Captain…”
“The visuals indicate life-readings, sir. And the Hoth system is supposed to be devoid of human forms.” Admiral Ozzel represses the urge to roll his eyes. These young, ambitious captains tire him so. “If we followed up every little lead a probe sent back—”

_{^{Star Wars - The Empire Strikes Back: So you want to be a Jedi?}}

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This assertion (that he's incompetent rather than devious) is backed up by the Official Star Wars trading card for Ozzel which offers some additional backstory about his earlier military career, persistently failing upwards due to his wealth and family connections.

Born into a wealthy Caridan family, Kendal Ozzel graduates from Core World institutes as a Captain of the Line but is relegated to teaching positions because superiors doubt his ability to function as an effective field commander. Even so, he continues to serve the reorganized Galactic Empire, eventually assigned to Darth Vader's Star Destroyer, the Executor.

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