Yeah, I usually binge-watch a shit ton of them at a time, and individual story lines tend to blur.
Anyway, I have to say Cyril. I was tempted to say Woodhouse, what with Cyril being a wimp albeit clever, and Woodhouse being a British combat veteran. But let's face it, they play up Woodhouse as frail and extremely ancient. If he were real, he'd have been the oldest living WWI vet in the world. That's just not a winning recipe for a fistfight victory against someone young and fit like Cyril.
I guess the last match up would be Ray vs Krieger, at whichever point in Ray's paralysis timeline you feel like addressing.