Kidd can't hurt him, that's why he is saying that. And I'm pretty sure it is affecting him, just because he is still smiling doesn't mean that he doesn't feel anything? Doffy was still smiling before KKG hit his face.
And yes he keeps them busy, at least on this chapter since he is the only one attacking and being targeted while the others are watching and thinking. If Luffy stops attacking, what will happen? Kaido and Big Mom will just wait? No.
And yes he keeps them busy, at least on this chapter since he is the only one attacking and being targeted while the others are watching and thinking. If Luffy stops attacking, what will happen? Kaido and Big Mom will just wait? No.