Online research revealed the pink heat shrink can come off the connectors. Apparently it's there in the event people fully connected the battery. I have no idea why anyone would connect a battery before the avionics wiring was run but there you go.
I also spent too much time looking for wire K6284. You get spoiled thinking all the wires you need are in the main harness but it's actually a wire found in the AV6000 bag. I couldn't tell what terminal those wires connect to (other than the one ground wire that's attached under the brake reservoir hardware) so it's back to more online research.
And finally, while looking at the routing of K7125 --- the starter relay wire -- I discovered I did not run WH-P154 from the starter relay to the master solenoid. So that's now added to the list.