First of all: Breitbart says "multiple sources familiar with the Fulton County District Attorney’s Office ***exclusively*** told Breitbart News." "Breitbart News granted the sources anonymity to discuss the attorney’s office for fear of retribution." Anonymous sources ... told Breitbart exclusively so no other investigative journalists (or LE) can investigative and verify (or disprove) them.
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"Biden Administration" refers to the entirety of the Biden gov, including the DoJ. "Biden Admin" does NOT mean "Biden" himself or even the "Biden White House."  
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It is known that Fed, State, and Local AGs and DAs share info. Willis collected testimony that made its way to the Smith investigations. Bragg shared info with the Feds. Presumably, the Feds shared info with the States and the Locals, too.  
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Jeff DeSantis is a lawyer whose resume seems to have been leading his current position as Deputy DA in charge of Media Relations in GA.  
http://www.fultoncountyga.gov/inside-fulton-county/fulton-county-departments/district-attorney/da-executive-team/media-relations-division/jeff-disantis
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Trump wishes that he could hire competent Republicans with those skills. Instead, he's stuck with Alina Habba.  Instead, we get stories like "Anonymous sources say Trump to hire [competent lawyer X] but [X] declined to take Trump as a client." kind of stuff. Who did you expect Willis to hire, Ginni Thomas? Bannon? willy?
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http://www.forbes.com/sites/brianbushard/2024/01/16/joe-tacopina-steps-down-heres-a-timeline-of-all-the-trump-lawyers-who-have-quit/
All The Trump Lawyers Who Have Quit: Tacopina Latest To Walk Away.
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Tacopina, Findling, Trusty, Rowley, Parlatore, Giuliani, Mitchell, Hughes, Kerns, Scott, "Porter Wright Morris & Arthur" (firm), "Snell & Wilmer" (firm), ... Chesebro, Ellis, Clark, Eastman, and Syndey Powell aren't mentioned in that article.