@intress: 90SK and I have never gotten along fabulously, but there are personal reasons and professional ones that have been discussed here and elsewhere for that. I never recommend his mods for that alone, but also the legitimate problem is that he uses slots and spaces that many other mods use, which creates app.2da problems for everyone that uses his mods. I suggest isolating stuff you like and implementing it manually, rather than installing his whole mod. Then you can avoid some of these issues. Try your saves, they may work, it just is not a guarantee.
@salam263 - look at your journal entries. If you need Kobayashi, track down where and when he is supposed to be by reading your journal. It will probably tell you the next step.