Unfortunately for you, the beauty and allure of the signed T206 card comes in the fact that there had to be some insight at the time (most commonly obtained via the mail in the 1960's and 1970's) to actually get a 1909-11 card penned by the subject.
In some cases, only a handful of T206's exist in signed form (with maybe 15-20 different subjects of the 524 to ever show up in signed form) and that transforms a common signature (say George McBride VG valued at about $40) that is valued in index card form in $15-30 range, into a $400 signed card.
The signatures you mentioned for the most part range out at about the McBride (a tad more for Wheat).
DanC
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