apoc games advice

ok so i just got the apoc book off a friend as i wanna plan a game its been suggested we do the good old imperial vs traitors so atm it looks like

blood angels , dark angels , space wolves
vs
Khorne daemonkin , (traitor)guard and they want 1 guy running chaos


now i think chaos are soo far behind now having no formations to speak of unless u wanna buy the black legion / crim slaughter books which this person does not have. so i saw this when looking in the book

forcing a narrative
(thanks to the freedom of apocalypes chaos players should feel free to use traitor versions of pretty much any
imperial formation, for example its perfectly reason able to see chaos pred assasin squads or renagade baneblades
with traitor guard , just add the appropriate blasphemous signs and the skys the limit.
a renagade chapter could even use a space marine company data sheet - simplt exchange the captain, chaplin and command
squad for a lord , dark apostle and chosen respectively. )


Now from this would it be fair to say that this person could run chaos versions of current marine formations for eg a sky hammer using raptors and havocs , or a libby conclave with sorcs ( i know there is 1 in the crim book but its really crappy ) and run a a traitor legion with chapter tacs on stuff that is unmarked making it a chaptor on the turn is does this seem unfair/broken


thx for reading and any comments welcome