Maybe to understand what Mr Dan is teaching you need to be semi-advanced with IS in the first place.
No. I don't think so.
Maybe to understand, what Mr. Dan is teaching, you just need to be taught by him in the first place?
It's allways the same: If you want to form an opinion about someone, you have to meet him. There's no other way.
If you are thinking about attending a seminar with Dan, I can asure you, you will directly experience his teaching in your body within the first minutes. And you will get an answer for every question. An answer which can also immidiately be experienced by yourself.
Please be carefull judging a teacher you don't know yourself.