Hmm, all this talk of power...
When you're braking for a corner, the power is irrelevant. You tip it in, possibly trail braking or not, depending on your style.
You dont use maximum throttle getting to the apex, and you only START to wind it back on post apex.
It seems to me that thrust is only used at the END of the process, and theres a lot that goes on before that.
I think the biggest difference between the style ( point + shoot vs crn speed ) is more in reference to the weight of the machine, and its consequent grip through the corner via its moments of acceleration (assuming quality of race rubber is equal and therefor slip threshold generated by a lighter machine allows higher speeds ).
What makes a good rider and where do they come from?
Well all I can say is look at Max Biaggi. He won so many 250 championships, so he clearly is a good example of a 250 rider. How has he gone in the top category...