I've been playing around with the fit advisor for a very tall rider. His inseam is 920mm. Recommended seat height is 812mm based on the 0.883 formula. When rider is displayed on the bike with the crank inline with the seat tube the leg is disconnected (i'm guessing leg in the model is somehow too short and this results in disconnection). Also the leg is locked out with a knee angle of 180 degrees. Am I missing something here?