> Do you think on this specific issue (that the election was stolen) that Independents ought to tell us a bit about what the average, non-partisan belief

Not in any meaningful sense; largely for related limits to those discussed upthread for general centrism: research on voting behavior that has shown those who identify as independents are not particular independent, and contain an identifiable major subset as reliably partisan as those who identify with a major party.

If by “average, non-partisan belief” you simply mean the belief of the average person who doesn't identify with a major party, then, sure, you will have defined it such that independents are key. But this isn't useful information.

I guess this leads to the question of if there is any way to use polls to get a read on how apolitical observers feel on a given issue through party affiliation. It sounds like the answer you have is "no", but I guess that leaves little value in polls in issues such as this one, given the salient issue (at least, to me) is how strongly it is held by non-partisans. I guess not for this thread.

> I guess this leads to the question of if there is any way to use polls to get a read on how apolitical observers feel on a given issue through party affiliation

There is no such thing as apolitical observers.

Obviously - but partisanship isn’t a zero or one