Check those rules again...
Except as noted herein, each Ground (GND) wire from a Speed controller, relay, or Robot Controller (begin underline) must go directly (end underline) from that item to one of the 12 Common (-) terminals on the circuit breaker Fuse Blocks.
They make the exception that certain low power items may be returned together.
NOTE: with one 12 fuse block and a MAXI fuse block, 16 circuits in all, you only get 12 returns. Some crowded, eh ?