Trumps lawyers are telling us they have no defense in the secret document investigation.

[FBaggins]

56. Not really

I entirely agree with your first paragraph (it is, in fact, what I've been saying).

It's the second 'graph I see issues with.

Trump’s only defense to holding properly labeled classified documents is that he declassified them while he was still president

He doesn't have to make a defense (just like me with my stolen watch). He only has to state that such a scenario is plausible and it becomes the government's job to prove that it isn't so.

if there is no record of that action then they were not properly declassified

That, too, is like the first paragraph. For you or me it would clearly be the case because that's the process that the law requires. But can Congress pass a law requiring a president to follow that process? I doubt it (see my Iran example in #23 above).

It’s likely that Trump, being the narcissist he is, kept the documents because he wanted to feel like he still had some power over the government.

Yep. That much seems clear. I'd very much like to know more about the documents themselves and what he planned to do with them... but that seems unlikely to happen.