Kizaru is just very underperforming this arc, which makes it very hard to compare them.
Try replacing Venusjuro or Saturn with Akainu, people would have died already.
Try replacing Venusjuro or Saturn with Akainu, people would have died already.
Kizaru performance is related to him not wanting to kill Vegapunk, an old man who is dear to him. Same thing Oda used with Aokij and Garp.