Duos Event

Hello friends, I got a duos event with my friends kid. We decided to take our new armies for a joy ride: Dark Angels (him) & Custodies (me)

Id like list feedback if its possible im still kinda new. Rules for event are:

1k per person

1 supreme warlord (no lion and trajunn)

Normal CP generation, so you share

Secondaries as normal

The missions are narritive through the entire 3 game event and change as the story progresses.

Your rules wont aid your ally (oath for example) but anything that says 'friendly unit' or 'unit in your army' will. Like if I went Lions if my partners squad of whatever is 4" away from my bikes no bonus from Lions rule.

My list im looking at as my models are limited:

Lions of Emperor

1 shield captain on bike w/ Admonimortis

1 shield captain on bike

2x3 preators creators

1x3 allarus custodies

1x4 witchseekers

Thats everything I own except the 4 Custodian Guard I own. Im tempted to drop 1 bike captain for an allarus captain with superior creation bit this would be a proxy (some are allowed as long as you inform others). My partner would probably be Wrath of the Rock he isnt sure as this is his 1st marine army (normally nids & t-sons). Depending what he takes im tempted to take Shield Host but I liked having the ability to divide the Allarus in back pocket for late game