If you want to be certain the other three don't remember the demise of their former fellow tom and stay away from the area where you harvested #4, use a different call, different decoy setup, and locate slightly differently in the area. As HomerJ notes, turkeys actually have a very short memory. In the fall, they'll forget they were just busted up by a hunter in less than an hour, so I think a few days' would likely completely erase the memory of seeing their fellow flockmate getting blown away!!

Good luck!!