Has anybody done Pine Groove at Crookrise? The latest guidebook bills it as 7B and says it's excellent. For things on that block, there's a big disparity between the latest book's grades and those on UKC (6B+ compared to 7B, for instance). Looking at the boulder, it looked like Pine Groove itself could easily be around 6B, but you never know. The other stuff looked like the higher grades could well be warranted.
The problem is that it's a tall boulder and everything on it needs a good scrub to bring it into a climbable state. It's also quite a difficult boulder to get to, being at the very bottom of the torturous to navigate Khumbu Area. I'm prepared to go down there with a rope and brushes to scrub it if it's an amazing 7B, but I think it's a bit much effort for a 6B.