Well, I've learned to never say never, but a quick glance on eBay shows 238 signed items from Winston, 188 for Todd Gurley, while TJ has 85, Amari has 79, D Henry has 57, Blake has 23. For comparison - AJ, who has been a pro for 9 months, has 212 listings.
Here's where things get really interesting. Gurley has 688(!) signed items are on completed listings on eBay in the last 30 days. Winston has 560, 129 for TJ, 116 for Amari, 135 for D Henry.
The number of Winston and Gurley stuff out there is staggering compared to anybody else I saw in CFB.