Good stuff but not accurate from my own tests and results. You're giving Enom the highest when that's so far from the truth in a broad sampling.
Enom/GoDaddy/Namewinner better than Pool/Snapnames is just far from accurate. A better test would be to take a multiple sampling over a few days from all deleting names and you'll find Pool destroys the others completely.
The best advice though from this is if you see names you want to catch, get in every available source for catching them.
