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So I haven't found anything in the rules that explicitly bans an idea I have and battlescrib allows it... But it feels like pure cheese: in regards to the AL warlord trait "I Am Alpharius", is the bellow a valid battle forged army or allowed in 2000pts tournaments?

Vanguard Detachment:
1 x HQ (warlord), Alpha Legion
3 x Elite, Alpha Legion
2 x FA, Alpha Legion

Vanguard Detachment:
2 x HQ, Alpha Legion
2 x Elite, The Beasts
1 x Elite, The Scourged

Outrider Detachment:
2 x HQ, Alpha Legion
1 x FA, The Flawless
2 x FA, The Purge

Yes, however note that your first Vanguard Detachment will be the only one that will qualify for the Legion Trait, as it's the only one made entirely out of Alpha Legion units.

Yes-note that ONLY your first Vanguard Detachment gets any Legion Traits.