Interesting! I would also suggest the possibility that the Wahoo was deliberately running the strait on the surface. There was a US wolfpack that did just that in 1945. They figured the best way out of the Japanese ASW net was a night run @ flank speed. Every sub made it through. The commodore figured that crawling submerged on depleted batteries there was a good chance they'd be trapped.
Pictures of the wreck might suggest a cause for the sinking. We'll probably never have more than a informed guess, however.
I agree. Even if there was torpedo damage, the undisputed Japanese ASW recods show that the Wahoo was worked over pretty thoroughly. I'm not sure the truth would ever be known short of raising her, which is never going to happen.