Oh it thought when kf mod team became part of tripwire and made the "commercial kf" they used ro?
i know ro and kf are both unreal mods
but wasn't ro more developed because it was an already released commercial game ... ( before commercial kf was made )
KF had its own coding etc etc etc before TWI ever thought of touching KF. when TWI bought KF, they didnt have to use coding from RO, but they did have to fix some of the bugs and messes in the coding (coding for KF mod was done by a few people, some good, some great, some bad)
also, KF mod team didnt really become a part of TWI. but since Alex made the maps and alot of the content he helped TWI with getting KF into shape. Zynthetic (the music guy) touched up some of his old music tracks from the mod. i think they were the only 2 who worked with TWI because around the time the mod was slowly dying - people were leaving, Alex had a harddrive crash, etc etc.. there was one final patch planned for KF mod: 2.51, it included the patriarch - which we now see in retail but with a few changes.
now i believe KF is being handled exclusively by TWI, but they did pay Alex to make a new map: KF-Wyre. anyways, yes, RO was in better shape because it was handled by a full team of very experienced people, but KF and RO are both seperate games with their own unique coding.