Without any comment on the need or appropriateness of Biden's pardon of Fauci et al, he has certainly given cover for any pardons Trump gives to the J6 prisoners.

Perhaps this gives us an opportunity for a new start.

However, just for full context and to pre-emptively avoid any comments to the contrary, the Supreme Court decided long ago that granting a pardon imputes guilt, and accepting it admits guilt.

This is why a pardon has no effect unless the person to whom the pardon was granted actually accepts it.  Further, accepting a pardon means that the person can no longer invoke the 5th Amendment against self-incrimination, since there is no longer any risk of punishment.  See:

Burdick v. United States, 236 U.S. 79 (1915)