[XW1n5t0nX]

I'm going to go with Blade. Kenzaki simply has the advantage due to being trained by a military organization as well as having more experience as a Rider and combat experience. Kouta was pretty much just dropped feet first in to the fray. He got better over time, but in the beginning he wasn't that greatly skilled of a warrior. So compared to Kenzaki who at the start of episode 1 already has the training and experience, Kouta just doesn't have what it takes.