Actually, accepting a pardon is an admission of guilt.You should read your links before you post them.
A pardon clears the record for that offense, do you really want to go down the road where a court can rule other wise. I can think of a hand full of pardons made by Brown recently to prevent the deportation of illegals the DOJ might want to revisit.
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You don't have an option to accept or reject a pardon, Arpaio didn't ask for it, Trump just issued it. Personally, as I said at the time, I think Trump was a little hasty, he should have waited on the appeals.
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Of course you have the option to accept or reject a pardon.
The Court ruled on that back in 1833.
United States v. Wilson - Wikipedia