I'll add one "data point" to Chris Hein's. Peter Bernath, a USAF 7th dan and shihan, has attended at least one workshop with Dan. As it happens, I have a friend who is a very well-seasoned 2nd dan in the USAF and who attends many of the major USAF seminars on the east coast. My friend has taken many classes with Mr. Bernath over the past ten years, and has taken ukemi for Mr. Bernath as well.
My friend most recently trained with Mr. Bernath in November 2012 at the USAF Winter Camp in Florida. When my friend returned from Winter Camp, I asked him whether Mr. Bernath had changed the form or substance of his classes, or made any reference to IP in those classes. The answer was no.
I've left my friend's name out of this discussion because he is not a member of AikiWeb. If anyone would like to contact him to verify his account, please PM me and I will put you in touch.
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.