Gryder probably already realized months ago the parachute isn't DBC's. This parachute is his youtube cash cow, he's clearly sleazy enough to never admit defeat and to keep using the "deep govt" angle he's peddling which probably will still attract the "fringe" crowd
I posted on reddit yesterday that Gryder claims the rig in his possession (if there was a possibility of it really being DBC's, it would be in the FBI's possession) is "one in a billion" due to it being modified. Yet, I posted a source that stated in the 50s and 60s modifying military surplus rigs were "extremely common". Let's go with the near impossible hypothetical that DBC gets positively identified as McCoy, he probably owned multiple parachute rigs, no guarantee he used the rig Gryder is shoving down our throats
More interesting, a tabloid dailynews article from a few days ago came out where Gryder claims the kids claims their DNA was a partial match to the DNA on the tie. This is likely untrue for multiple reasons but the main one being this story was true it would be all over the media as the first suspect DNA link ever in the DBC case