Some interesting legal thoughts are emerging on the YouTubesphere.
I'm no Lawyer, so I'll describe as well as I can.
The assertion is that a person who accepts a pardon, accepts they are guilty of the charge, and surrenders their right to 5th amendment silence.
Let's look at the case of Bannon.
If Bannon accepts the pardon, he is in the clear, but he accepts that the crime he was accused of occurred.
Good news for Bannon, bad news for his co-accused.
Further, Bannon can be taken in and questioned (I think this is similar to Subpoena'd, but can't be sure).
He now can't "take the 5th", so will become a witness against his co-accused.
The folks explaining this suggest that the Pardon is great news for the pardonee, and very bad news for the co-accused.
Like a plea bargain, but one you can't refuse.