Regarding OP's thoughts on the Buck Leonard 150 autograph piece, I have some thoughts as well.
It's a limited edition of 1000, but it's not clear if it's a signed edition of 1000.
I would guess that it's a signed edition of 1,000 as the signatures are just too organized. They were probably signed in the same place by each person.
Given that, it was most likely signed at an organized event. Should take about a minute to find a possibility.
http://buckoneil.com/articles/one-la...eball-history/
http://en.wikipedia.org/wiki/Legacy_Awards_%28NLBM%29
Why would anyone want or need JSA, or anyone else for that matter, to provide an additional "opinion", rather than rely on the "fact" of who and who was not there?
BTW,
http://www.ebay.com/itm/Babe-Ruth-Au...item4cfc8db6b0
seems more of a secretarial signature. It's more likely to be an actual game used ball than a signed Ruth.