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The question is a little bit vague. To make this desicion, you must first know your load. The NEC will allow you to go with a 200 amps OCPD IF this is a dedicated circuit for just a specific load. However, if not then you must go with 180 amps. In real world applications you as a designer must...

You can conclude that 6 and 7 may not be necessary IF you know for sure that this is a radial system ending at loads that do not feed the fault at bkr 4. Now, if we don't know what is connected to feeders 6 and 7 then you should see those breakers as a remote backup for bkr 4. The same is for...

Bkr 3 is a local backup and Bkr is a remote backup which must act between 12 to 30 cycles after a fault at bkr 4 primary zone.