they're too fast for guns, theres no need for them.

my point before was that it really didnt matter about him being a chuunin

Kabuto never got past a genin ranking and look at how strong he is? equal to Kakashi or more.
Haku was never even a genin
we know nothing about Tsunade Orochimaru and Jiyaira becoming chuunins and very little about them being jounins and yet they are the strongest people in the naruto world

you can look at those and go 'wow' or just look at everyone else... also Kabuto seems to kill ANBUs like its strolling down the street, i think hes killed about 9 so far that we know of