Crabb snorts softly, "I'd hoped so, yeah. 'Cuz honestly, Cass, lotta the others I mighta asked to join this here? They're indisposed."

Erin's already absent, for one. Peter's been gone since their first day here. So on, so forth—everyone's occupied with their own issues, or worse. Cass isn't a last resort, she would've been someone Crabb went to regardless, but she is quite possibly the only resort.