Isaiah 

I don't think the left-hand start is any harder than the thin hands bit at the start of Isaiah proper. I'd call them both 10- personally. This might be the pumpiest 5.9 I've climbed anywhere. It's my favorite climb at the overlook.

Yeah, I totally agree. I cruised the supposed 5.10+ part and then flailed in the 5.9 part. Repeated whippers I tell you. So much so, that my belayer says "maybe you'd like to put another piece in!" Ha, ha.

Ease of the opening move from the ledge greatly depends on your hand size.

I think the left hand start is supposed to be 10b ish, according to mr karabin anyway.

3rd Classed by Ross Hardwick in late '70s.
Sorry, didn't mean to imply 1st ascent was solo. Just that Hardwick had soloed it.

First was early 70s or late 60s by ??? (Baxter, Karlstrom, Taber ??)

That makes more sense. I dropped my jaw when I saw it said the FA was ropeless. That seemed pretty unlikely.

I personally find the one move getting off the ledge as hard as any move on the Trinities.

BTW - I think this is a 5.10 climb for most people. For an experienced thin hands climber, ok 9+ if you want.

When I climbed here a lot, yeah there were times is was 5.9-. But to walk up and onsight this ? It's gotta be 5.10. Calling it 5.9+ is being old school gnarly and is in keeping with the local ratings. 9+ was the Az rating for, "We didn't realize we were 5.10 climbers." (Baxter, Baker, McEwan, Axen, Taber, Trieber, and others, these guys all could lead solid 10+/11 given the right climb and the right day.)

Look at the above comments, repeated whippers on 5.9+ (good on ya Aimee for putting it out there), both starts 10- (I agree), as hard as the trinities...

There's no shame in up rating a climb.

i'd say the hard start on the left is 5.10 (maybe 10b but not 10c) and the crack itself is 9+, or maybe a solid 9. calling it harder than that because the one move off the ledge is kind of tricky smacks of grade inflation. once you get past that first move it's all sinker jams and jugs to the top.

Excellent route, recommend the easily protected lefthand start.