So you have 10 apple ID's, all of which begun with "a".
You know each of these ID's but not the passwords?
Surely you would then go through the ID password reset procedure on each one, trying each one with a new password until the iPad unlocks?
Sorry, I don't believe a Developer would forget such information and I think you're clutching at straws. I don't believe the "call log" you added is real and I think you've found an iPad with a beta build of iOS 7 on it and have been stumped by Activation Lock.
And as for the "advice" of waiting until the 18th to restore to the public build? It'll do the exact same thing.