bike size for xc racing

Looking at some of the top riders where I race, their bikes seem a bit on the small side for them. Is this something good racers might go for (ie take a size down) to be more maneuverable on the technical stuff (eg easier to get the front wheel up / butt off the back of the seat etc). A mate was also advised by his LBS to go a size down on a carbon HT if he intended to race. Has anyone else come across this and is there any merit to it? Thks!
Scott Scale 20 (for xc racing)
Gary Fisher HKEK (for commuting)
Gary Fisher HKEK (for commuting)
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Each to their own really. I suppose the only thing is a smaller frame will weigh less, but i'd rather have perfect pedalling/riding ability rather than 50g's less weight.
http://img.photobucket.com/albums/v496/ ... C09729.jpg
Kona Coilair 2007 Dark Peak Destroyer
http://img.photobucket.com/albums/v496/ ... C09727.jpg
"BOCD - If it aint perfect it aint good enough"