Thanks. That explanation makes sense to me and I'm happy to go with it.

It's easy for anyone to rule out that getting hit works like hitting because stuff with decent base damage never hits for 0 regardless of a player's defense. From there, the only two options are that every monster in the game has vastly higher attack than anyone would ever expect or that there's a lower bound of some sort. The first obviously isn't true, so yeah, a floor of 1.0 on cRatio makes sense to me.

I'd feel bad pestering Byrth about where to find information about something that sucks just so I can more bitterly express how hard Gallant's Roll is going to suck. It's not like anything will be changed either way.