I agree-some sort of tinder to go with the firesteel. I prefer cotton balls soaked in vaseline stored in a pill bottle or baggie, but fatwood works too. Also a striker for the firesteel isn't a bad idea. I would stick a BK13 in the 9's sheath since it's designed to hold one--I always find myself wanting a small blade, but I've never found myself wanting or using a multitool in the wilderness unless I had mechanical devices with me that needed repair (mountain bikes particularly).
I also carry a small sharpener in any sheath that has a pocket. I like the mini DMT's in fine/red, but I've heard the Lansky mini sharpeners (dog bone?) work well too.