I think it's just more of Ed's parental blindness. Fact is that bringing Grace and Tedd would be good ideas, and neither of them would have much to fear (Grace after all comes from a weird supersoldier program and she is absurdly powerful, Tedd could make a wand or watch of very expeditious retreat if needed), while bringing in the Dunkels would be a terrible idea. (Unless Dan Shives is going for the surprise reveal that they're overpowered badasses too but that wouldn't bring anything interesting to the story as well as contradict all their previous characterization.)

Adults that could be called in: Adrian Raven and Sensei Greg. Would be nice to see Greg again, actually.