As a lawfag, I think several have made decent arguments trying to pin Scalia down. With all we have seen though, I find it hard to believe he was a White Hat. His opinions were my favorite to read in law school, especially his numerous dissents, but I just don't think you get into that position without being compromised in some way. I think the cabal's issue with Scalia was that he couldn't do something out of character for the persona he had established over years. He was dug in on many issues and could not do the bidding of any controllers without turning the head of the entire legal field. If it came down to him on something they needed desperately that damaged the constitution, he just couldn't believably change position.
My gut tells me he was black hat in the end, or maybe gray hat at best, but that he was going to be a thorn in the ass of their 8 year plan under HRC and had to go.
He's one of the ones I'd love to be wrong on and find out at some point that he was always the man he presented himself to be.