I'd be really worried if I was a Luffy fan, Kizaru seems to be a lot more casual than Luffy. Luffy has pretty much been throwing out his entire arsenal full throttle. Kizaru still looks like he's not fully serious, and even with all of that he's looking better so far.
I shit you not it looks like he's been treating Luffy like a kid. Maybe finally taking some damage and Saturn coming out means the weights are coming off.