I've done several signed player runs, though all of ,mine are 1960s football. I agree with Mike in that if Robinson is such a willing signer, then try and tackle them in the way that Mike suggests. That way you are pretty much guaranteed a quality end product. If you pick them up on the fly, then you will ultimately have mixed ink signatures, and have to "settle" on card condition when you finally find a signed example of some of his more difficult issues (1967 Topps).
You can see some of my signed player runs by scrolling down to the bottom of the link below and clicking on the player collections.
http://talesfromtheamericanfootballl...ing-card-sets/