Yes if kakashi can teleport out of obito's dimension i see no reason why he cannot actually teleport himself from one location to the next because he has already done that in this chapter. It also seems like his ability to warp himself is faster than tobi's therefore it comes down to who the fastest ninja is, whether its now minato or kakashi because hirashin is instant, whilst kakashi kamui version is faster than obito's when he warps himself. Yep kakashi is now at least the 2nd fastest ninja