I've seen some videos on Moe, and read the book Moe and Me but never actually saw him play in an event. He seemed to be heralded as a great ball striker and would put on shows at the range where he worked but because of his mental limitations he couldn't handle the pressure of the PGA Tour.
I might accept he was Top 10, but #1 seems to be a reach. If his ball striking was as good as @soon_tourpro claims, then it really begs the question why more people haven't tried to duplicate it.
I'd never even heard of the guy until I found this website. I just tried to go find some info on youtube, and the only thing of interest was a 10 minute video where he plops down about 25-30 shots from maybe 75 yards? All really close to the hole (with a generous backstop, but still) and maybe the furthest one was 15-18' away. Regardless, it was pretty impressive.
And other than reading a couple of paragraphs on wikipedia about him, that's about all I know.
Oh, and I had heard the old story about the eccentric guy whose caddy told him the hole called for a driver and a 9 iron and he hit the 9 iron first ... but I didn't know that story belonged to Moe Norman.