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I agree that some of his moves are kind of stupid. Some of them just feel like incomplete versions of Bayman's. The ones you mentioned are good examples. Another example would be 1P. They both have the exact same 1P, but Bayman can follow it up with P and even hold it down for more damage, whereas all Leon gets is the initial 1P. Kind of lame.
I certainly hope he gets a lot more diverse and unique in DOA5U.