World of AI is FS9 native AI scenery, whereas I suspect the CS intruders are FSX AI scenery. The two are incompatible; if you run an FS9 AI scenery inside FSX, it will cause the FSX AI scenery not to run.

Perhaps you could convert the World of AI flight plans into the FSX format using something like TTools (a Herculean task) or perhaps you could convert the CS intruders into an FS9 formatted flight plan.

Either way, I don't think there's an easy solution that doesn't involve decompiling, modification of a source file, and recompiling.