On the twist to Paxman's - - -;
UP to the 200A Mains' they are Service Entrance Conductors.
250.102(C) would apply.
Note: Senerio 2) has two 3/0 Cu per ungrounded conductors from the CT cabinet to the Pull Box so the Metal Raceway ( conduit ) bonding bushing jumper would be based on two 3/0 Cu ( 167800 CM each ), 335,600 CM.
Table 250.66 = 2 Cu.
Thus:
Line side of CT bonding bushing jumper = 1/0 Cu.
CT to pull box bonding bushing jumper = 2 Cu.
Pull box to each 200A Main bonding bushing jumper = 4 Cu.
All minimum size(s).
