It may be disgusting but is done all the time in major cases, the Feds go after the lower-level people first, offer them a deal to flip in exchange for a lighter sentence and using that strategy they Feds have put away mobsters on down.
If you see Rudy Guiliani or Mark Meadows pleading guilty really soon, then Trump is in real danger.
Meadows is the more likely to flip. Giuliani is non compos mentis.