We knew it was Raven from Gaming Revolution's first BR discussion early last year.
I don't know why they don't give Raven the credit and make it seem like its all IW's work.
Raven made the freaking map that IW reused for Spec-Ops and MP maps.
I do wonder how complicated tuning and such is considering Raven is BR but IW is those technical settings with everything else.
Raven does get credit what are you talking about? IIRC, Raven, Infinity Ward & one other studio (High Moon maybe?) are all in charge of Warzone.