So it sounds like the Killian contract is an exhibit 10 training camp contract. Usually those are just used to bring extra bodies in for training camp. It is league minimum and no amount of money is guaranteed. I believe it also adds some G-League benefits as well. You can assign guys you cut from training cam to your G-League team without having to draft them, or something like that.
Looking around, it appears Fred VanVleet was once an exhibit 10 guy. Almost all of these guys end up being cut though.