Lmao, personally this is why I think the win/loss ratio has no meaning, because apart from people with 0 wins, Kiro's about as low as it gets, and yet he scored a win against Sagisō who at that point had only 1 loss.
The chart is merely statistics, hardly worth looking at to determine the outcome of a fight.
It does tell us who has had a good or shaky road up to this point. I should know as the proud owner of multiple zero win characters XD
And really Kiro's loss record is more of a reflection of his in-universe effort rather than his ability so for him specifically it is a poor reflection but mainly him alone.