Master kagaya wasn't sure of your skills since he didn't think You are capabile of the title of hashira so he sent you to Muichiro Tokito the formal mist hashira to test your skills for 3 mouth's to make yourself worty of the title of the Hashira

"If you are going to be my student show me what You got!"

Muichiro said with an emotionlees expresion he was annyoed that he had to train You since he also tought You are not worth judging by your Pyshical Condition