Not every word JB rights is a conspiracy. Sometimes, he's just telling a story.
It is possible to use more than one aspect on a single roll, but you can’t use the same aspect more than once on the same roll or action (even if you’ve re-rolled the dice, that’s still the same roll or action).
Hell, one of my characters made something of a hobby out of brainstorming situations where he might be able to invoke all seven of his character's aspects on a single attack.
Thinking too small. He should also be able to invoke the scene aspect, the location aspect and all three city aspects. You should also be able to invoke some team work type aspects, and navel gazing aspects you've created. If you aren't punching out the lords of outer night with a small girl, you clearly haven't invoked enough aspects.