If you're implying that Peter didn't think much of Dan...then I suppose that it's best to talk to Peter directly about that. My impression however, based on conversations directly with Peter (not some ni-dan who sees him at seminars) is quite diferent.
* "Are your standards higher than 17 Shihan, 6 6th dans and 52 go dans and hundreds of others?"
* "but it sure has changed the minds of over a thousand Aikido people from shodan to shihan."
* "Would you be surprised if I listed four shihans and two Koryu sokes who said the same thing in 2012?"
all quotes from this thread. Shame they aren't scrutinized as intensely.