question asked, question answered.I'm not sure what you mean by "well kept secret."
Basically you probably didn't see many translations because arai and the others tend not to translate things that don't describe new lore information. CM2 is all character design notes and comments. Although those can also be quite insightful, most of them talk about things that don't exist in the final draft of Fate/stay night.
(well kept secret refers to that while things from CM 3 are relatively easy to peruse, learning things from CM2 usually requires just happening to be on thread while a Japanese speaker is mentioning something he read, or alternatively hoping seika had happened to be on thread when a speaker mentioned it and then later she added it to her notes file)
At any rate, to avoid a minor derail on the relative merits of CM 2, to draw back to the original statement, since Nasu has said two things which are flatly contradictory, I think at this point the only thing a fate fan can do is make his or her own judgement call.