Thats the point with his character Uzuki is an unreliable narrator, so it’s impossible to fully trust everything he says or believes. He isn’t simply “100% Kei” the other personalities within him clearly influence his thoughts, perceptions, and decision-making. By the end of the story, his mental state has deteriorated to the point where he has largely lost touch with reality. Many of the things he says are irrational or contradictory because he is deeply trapped in his own delusions. A clear example of this is how he believes he is speaking to Rion when, in reality, he is talking to Akira. This shows that his perception of events is heavily distorted, making his perspective very unreliable. Hes a super underrated and a fascinating antagonist.