>Assume that there is a sequence of tokens, such that it is considered the absolute best by the author

You can't assume that because if that was the case he'd already know what sentence to write, because that's what that means.

The notion of a best sentence requires a final cause, an end to write to. By their very nature that's not how LLMs work, so you can't 'degrade' them on that front. They can't lose a property they didn't have.