Its very True what LIC said
Street fighter always changes, Even if it is the speed of the characters or damage the moves do, every character undergoes a series of modifications in every street fighter game. If you are the master of Ryu in Alpha 2 it doesn\'t mean you are the master of ryu in alpah 3.
This is what all the doa games have been lacking, the only thing that ever changed were the move from square non-Interactive fighting planes to 3d interactive backgrounds