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So if I understand this correctly that means the 31/2" drivers are the tweeters and the back drivers are the midrange with the door subs used for the rest?
No. The subs are subs. The 3.5 and 5.25 are both 'full range' speakers, but the C6 amp also acts as a filter/crossover and eliminates the low frequencies going to them.
Funny thing is, on the very few ultra high end audio competition cars that used rear speakers at all they were usually just mids, sometimes just one in the middle rear, played at low level and a narrow bandwidth, no tweeters, if two sometimes in mono.
I got rid of the entire system right after buying our car and never looked at the ohm rating of the rears but if 4 ohms or close I have some very fine sounding very reasonable cost ones I offer as part of my system packages for those wanting rear speakers. I have several to choose from actually and from very good manufacturers.