Do recent events suggest Katsidis can't actually punch?

Yeah your right Bilbo Amir Khan destoryed Earl in 1 and Katsidis took 5 rounds while getting himself knocked down in the process. He had trouble with that flip Amonsot or however you spell his name in his American debut as well. I remember the flip getting KO'd himself in 1 too before the Katsidis fight and people expected Katsidis to walk right through him. Yet Katsidis only won a points decision. His chin ain't exactly granite either.

Katsidis was pretty much ruined in the Casamayor fight. The Diaz fight didn't help either. He will always lose to the big names