Jackskellingtongirl, Bob's opinion is that the lower crowd level is always better. So if you were choosing which day to go to the MK, and one day's a 4 and the other's a 6 with a "best day" recommendation, choose the 4.
Why? The lower crowd level is always better, according to Bob. Also, remember that we occasionally recommend a park because we have to - one of the underlying assumptions in the "Best Days" calendar is that we recommend each park at least once in any seven day period. This is so a family on a weeklong vacation can be sure to visit each park on the best day possible during their week. That occasionally means that we have to choose a "least bad" day for a park, rather than a "best."
Finally, I updated the crowd blog with Expedia hotel room availabilty through May, just a few minutes ago. I'll have updated crowd predicitons, as well as a summary of how well we've been doing, on Sunday. (Short answer: not bad overall, given the complexity of the task, but not quite where we want to be yet.)
Len