Never heard the turtle story. Have trolled out in the Lake. Needle in a haystack. The Canadian shoreline area has a lot of interesting structure, though.
I do believe the muskies might swim with the walleyes. On occasion we had double headers. Big muskie on one rod, big walleye on the other. I think they were targeting the same prey. Also caught them in the same areas at the same time. But that was mostly in the north gap area. If big walleyes were in the area, big muskies were usually close by.
On Tuesday night I recall that Mike Clancy indicated that the implanted walleyes did migrate in and out of the river. If the muskies swim with them (shared forage), they would, too, I think.