I agree with you to a point. There may be some who can do that, but I would bet they still feel better with a caller. When I look at unknowns I try to get a general sense of the maneuvers and an idea of what they are, but I think it can be very difficult to truly memorize a sequence, although I'm sure there are some who can. I certainly wouldn't recommend this for someone in the lower classes who is still concentrating on the smaller elements, straight lines and such. You are just adding an unnecessary amount of work to them. That's why I used the term ''virtually impossible.'' It can be done, but I don't think it would be recommended.
I'm going to try to hit a few IMAC contests this summer.
OK Arch... I understand what you are saying. Let me clarify something.... I have NEVER flown a sequence without a caller in 18 years of competition (even in Knowns) & I certainly was not suggesting that any pilot do so at all. What is important is that a pilot should know what he/she should be doing next & the caller should only confirm when he/she calls the maneuver for the pilot.
There have been many times that callers have made mistakes & if the pilot knows what is next, a ZERO or two can easily be averted...
Safe flying & hope to see you out there too..