I don't know about the gloves (whether he had them or not), but I think he didn't expect the blood. And that's why the pullover is missing, and why he wouldn't have been concerned about the HP's. The big issue with that is the size 10 Franklins. Those would mean, if possessed by JY, that he planned to leave tracks of something somewhere. And if he planned that, then I agree it would be bad judgment or a very bad plan to have put on his traceable shoes and then leave footprints at the scene.
I think the size 12 footprints are strong evidence against him. But the Franklins remain a mystery. I'm afraid it probably could mean there were two people there. And that is a big can of worms for the state if that is the case.