Well just because there's no wah doesn't necessarily mean anything. Yeah he used it frequently, but not on every song. And I'm sure he didn't lug his whole set-up with him all the time. Jimi was noted for his effects over the strings on albums and on stage. I imagine just noodling around in the wee hours with friends (at their place) is a little different.
But like I said above, I think it's the sustained feedback, runs, and certain tremolo dives at points (in the latter half especially) that lean towards Jimi. Otherwise some of the actual struck notes are perhaps over attacked. Even Jimi wasn't in his finest form at all times though...I have a cd with him and Jim Morrison playing in some club together that certainly sounds different from his "polished" work. But yeah, someone like Jimi would have imitators, so that's possible too. Truthfully, I can't say definitively either way...but if I had to guess I'd say it's him.