Links that end in brackets don't work on this forum unless you use the [url]...[/url] tags.
The very first line of your linked page says: "Some interpretations of quantum mechanics posit a central role for an observer of a quantum phenomenon." [my emphasis] Interpretations are not the theory and this is something different from the uncertainty principle and whatever you think "schrodinger effects" are. So you were just posting bullshit.
And you still haven't provided a logically consistent explanation of how anything can be a 'necessary entity', you just keep on making up different characteristics it must or can't have as you go.
I perfectly understand about ideas in quantum science being just punts as to what is really going on and I am just having a punt to suggest that all contingent things we know and will know of are observable and therefore could be changed by their observation. Something that wouldn't affect a non contingent entity.
Although most of what you offer is imo eclipsed by angry bluster and goal post shifting what comes through from you is everything has an external reason.
We can be certain of two things though, existence and non existence. We know that non existence has no effect on anything so if something exists it exists for itself. And there we have an explanation for why there is something that exists and can only fail to exist because of itself. I have conceded that existence is brute but yours and mine won't be in a few years time because we won't exist.
So then we end up with a final entity which nothing external can prevent.
If you want an infinite argument about what constitutes brute by all means continue to fuck about around with that.