It seems the predominate thoughts are this one does not meet the criteria to be considered authentic. It also did not pass a full JSA authentication either. It came from a solid source. But, I have learned, sometimes the hard way, the source is not enough. Even a "top flight" source.
I tend to wonder about how many collectors think they have a rock solid signature that will falter when they decide to sell. I've seen this happen far too many times in my limited time watching this market.
A word of caution. Well known opinionators are not authenticators. Buy autographs that will stand the test of time.