There’s a difference between ego and information. Charles has good info in the lifting areas, which is sometimes lost in the hype over the level of strength you actually need and you need to assess how far to carry it for your athletes.
Opinions vary over his openness to questions. I’ve heard everything from getting shut down to very helpful, so I assume it depends on the approach and the day.
If I wanted to prepare for a CP seminar, I’d ask those who’ve said he responded well in the past exactly how they asked their questions and when.
My personal concern at my seminars is whether or not there are questions. If there aren’t, I always fear I’ve screwed up and everyone is lost. A good seminar will always lead to lots of questions- and usually a happy presenter!