Two things:
1. In the immediate sense, Koli knows everything he needs to know. They are Daimons, they are far too powerful to fight right now. Thus confrontation is unwise, time to build up/unite humanity first.
2. Too busy with internal Lurian issues. Koli and the rest of the leaders of the Path have been working very hard to try and keep another civil war from starting. And, of course, the week Koli decides things are stable enough that he can finally take his trip to spread the good word, another potential one starts simmering.
You forgot
3) Lurians would have to trust those sources. With pretty constant civil war and internal bickering, a lot of Lurians aren't the trusting type
4) We would have to be aware that those group HAVE knowledge to share. I'm not that sure that many in tMP realise that other groups have any substantial dealings with the Zuma other then the present war and some other minor conflicts in the past.
5) Juan a priest of tMP actually knows quite a bit about the Zuma, from when we dealt with them during the plan to establish Asylon, he chooses to be silent for his own reasons.
But really Bedwyr's first point sums it up. The tMP like to talk about civilisation, about logic reason and such, but when you get down to it they can be just as close minded about reviewing their beliefs as any other religion. We don't seek knowledge about the Zuma because really we don't entertain the possibility that our initial position could be wrong.
