You can bet the withheld videos would exonerate a number of the January 6 defendants. From Joseph M. Hanneman at The Epoch Times via zerohedge.com:
The defense attorney for a member of the Oath Keepers charged with seditious conspiracy stemming from the U.S. Capitol unrest on Jan. 6, 2021, has filed a motion to intervene in a lawsuit that seeks to compel the U.S. Capitol Police to release more than 14,000 hours of video from surveillance cameras, smart phones and police body-worn cameras.

Jonathon Moseley, who represents Oath Keeper Kelly Meggs of Dunnellon, Florida, seeks to intervene in Judicial Watch Inc. v. U.S. Capitol Police, a 2021 lawsuit that aims to unmask most of the Jan. 6 video footage now hidden from the public by court seal.
“Having seen the documents and records under the court’s protective order, Jonathon Moseley can testify and affirm, and hereby does so, that there is no valid reason for the documents and records to be withheld from the public,” Moseley wrote in a Feb. 11 motion in U.S. District Court for the District of Columbia.

U.S. District Judge Florence Y. Pan denied Moseley’s motion to intervene, ruling he did not make sufficient effort to determine how Judicial Watch and U.S. Capitol Police viewed his motion.
“The movants do not have a conditional right to intervene under a federal statute, nor do they state a claim or defense that shares with the main action a common question of law or fact,” Pan wrote.
The U.S. Congress is exempt from the Freedom of Information Act. The U.S. Capitol Police, as a subsidiary of Congress, isn’t bound by the 1966 law that generally requires the federal government to disclose records and other information to the public upon request.
Judicial Watch sued Capitol Police in January 2021 under the common-law right of access, a legal principle that the public has a right to access public records and documents.
Judicial Watch sued for the release of all video recorded between noon and 9 p.m. on Jan. 6, 2021, and for emails between the U.S. Capitol Police executive team and the police board, as well as emails between police and the FBI, U.S. Department of Justice, and the Department of Homeland Security.