2019 CrewMax non-JBL - Low rear speaker output w/ Alpine ILX-F259

Looking for a little guidance. I was upgrading my factory head-unit with the Alpine ILX-F259 and came across two issues. The biggest one being the low audio from the rear speakers which I assume is due to the amp not properly turning on. The second being the "powered antenna" feature, which the Crux SWTRY-61N kit shows one of two plugs should be used but does not appear to be the case.

Question #1 - Low volume from rear speakers:
On the wiring, the factory 10-pin connector (J144) shows Pin 9 is a body ground for the amplifier. On the Crux SWRTY-61N kit, that mates to a Blue/White wire which they list as not used. I am assuming I could safely add this to my ground connection, but I wanted to seek the input from the community.

Question #2 - Does the Tundra use a powered antenna feature for any reason? The radio antenna does not have a matching power line from the connector and J144 also appears to not have a pin for the connector.

References:
Factory harness connectors J144 + J145: https://tnstatic.net/attachments/tundra-amp2-jpg.239174/


Crux SWRTY-61N Connection Manual:https://www.cruxinterfacing.com/wp-content/uploads/2017/08/SWRTY-61N_MANUAL.pdf

All other features appeared to work correctly with the connection. I appreciate any input!