And in the document theft case...

A key focus for prosecutors is Walt Nauta.

[...]

Prosecutors have indicated they are skeptical of an initial account Mr. Nauta gave investigators about moving documents stored at Mar-a-Lago and are using the specter of charges against him for misleading investigators to persuade him to sit again for questioning

[...]

Proving intent is often a challenge for prosecutors, and that hurdle has repeatedly come up in various investigations into Mr. Trump. To that end, prosecutors are particularly focused on Mr. Nauta because he could provide insight into Mr. Trump’s intentions as he parried the Justice Department’s attempts to reclaim the documents from him at the same time the materials were moved around at Mar-a-Lago.

If the boxes were moved against the Justice Department’s wishes or to conceal them from the authorities, it could help prosecutors in developing the obstruction investigation.

Mr. Nauta, a native of Guam and a U.S. Navy sailor, grew close to Mr. Trump during the White House years, when he worked as a cook in the Navy mess in the White House and then as a valet in the West Wing. He was a frequent presence around Mr. Trump, bringing him the Diet Cokes he often consumes or carting things to and from the White House residence for him.

[...]

At the same time, the prosecutors are trying to force a longtime aide and ally to Mr. Trump, Kash Patel, to answer questions before a grand jury about how the documents were taken to Mar-a-Lago and how Mr. Trump, his aides and his lawyers dealt with requests from the government to return them.Mr. Patel was designated by Mr. Trump this year as one of his representatives to the National Archives and Records Administration to deal with his presidential records, particularly in relation to materials from the investigation into whether Mr. Trump’s 2016 campaign had ties to Russia.

[...]

Shortly after the F.B.I. executed a search warrant at Mar-a-Lago in August to reclaim the classified documents, Mr. Patel publicly proclaimed that the former president had declassified the records before leaving office. But Mr. Patel refused to answer many questions this month before a grand jury in Washington hearing evidence about Mr. Trump’s handling of the documents, citing his Fifth Amendment right against self-incrimination.

  NYT

And repeating that Trump declassified records to the FBI or before a Grand Jury would certainly incriminate him.

...but hey, do what you want...you will anyway.