Yes, Kizaru's finishers (awakening?) won't be sword based, but as for non awakening, the sword is a serious move for Kizaru. Yes, Kizaru uses his weapons accordingly to his opponent, but it doesn't make the sword more casual. He used kicks against 5 pre TS Supernova (Hawkins, Apoo, Drake, Luffy, Urogue) but against Rayleigh, he pulled out his sword and called the situation troublesome. Kizaru knew that his sword is more adequate against Kizaru than his kicks.