Shoeless Joe Jackson Auto- Fake?

[Klrdds]

Ok I'll bring this up since I've not seen this brought up .
If the signature on the just auctioned photo is authentic , and the signature on the composite is authentic , and the 3 examples that Frank posted are authentic then can someone please explain what happened to Joe in a span of 5 -6 years to have his signature change so dramatically and actually become truly deteriorated compared to those earlier examples on the photo , the composite , and the books Frank posted ?
There is no mention of Joe developing or having any debilitating sickness or injury or physical limitations or alcohol abuse or mental issues which could cause drastic and rapid signature decline. Plus looking at his on field performance I think it's clear he had no problems.
So then what would be the cause of this drastic signature change ? AND yes it is a drastic change in his signature . His signature after roughly 1915 /1916 never changed for over 30 + years.