I may have soloed it way back, but can't remember, I went up there and climbed, but the rest is unclear. Too many hard hits to the old head, and lots of hootch back then. So, no... you will be the first to do it. I can see it from my house, a beautiful slab.
The left arÍte is a real good 5.9 highball. The center is very hard, you would remember soloing (highballing) that one. Jon Gipson says "Hi". Hike up and check it out again, might jar some memories. We may be out at JT this weekend if your game?
Sure enough, probably would have remember it. But I do remember reaching for that horizontal, probably from the 5.9 ArÍte. Like I said lots of top talent has been up there, but if no one reported it, and no one can remember, then u have every right to claim the first:)