Well she could be a spy, like ‘I’ll get rid of the nite owls and you can keep your cult, you just have to lure them to me’
That’s supported by Bo’s admission that she surrendered to Gideon only to be double crossed

I suppose Gideon could have lied to Kane to cover his bases, but that’s more of a stretch

Axe is obviously the easier one to pull off and, it would give Bo another crisis in leadership

Perhaps the most intriguing scenario is that Bo dark sabers Gideon before learning who the spy is and she has to determine if it’s Axe or Armorer