As far as I know this is pretty much the main problem with Ross Ulbricht's case, not necessarily the fact that he was imprisoned. I mean, actual killers and rapists have had far less prison time than Ulbricht's absurd double life + 40 yrs without parole sentence. His life sentence was as if he caused a new Holocaust.
I'm convinced that the drawn-out prison sentence was more of a message.
Anybody who followed the story about SilkRoad and Ross Ulbritch knows that it was not just one guy called Dread Pirate Roberts but it was more people behind that pseudonym and not just Ross.
I agree with you that administration wanted to make an example from Ross Ulbritch and send clear message to everyone who would dare to make open free marketplace like that again in future.
I also doubt in any proof claiming that he kingpin who was thinking of ordering some murders, and we know that some dirty agents got arrested in this case that makes everything dirty.
Double life sentence for Ross should be reduced but I doubt this will happen because current US administration is just a continuation of one that sentenced Ross.
I am not familiar with US law but I believe that after failed appeal only hope left for Ross is that US president pardons him, however I don't expect to see this from Biden.