If he was thinking about summoning Death before, he was really considering it now. He wanted answers, both for Jo and for Sam.
"Okay."
He wasn't going to tell Sam 'no,' not when everyone could use his help. Sam's research skills were amazing--the things the kid could do with a laptop.
"Well, in addition to Mr. Wizard and Vampirella, we have help," Dean said. "Couple people in town that know a thing or two, and... y'know, I'm just gonna load you up with the crazy upfront, okay?"
Best way was quick like a bandaid...
"There's a hunter here from the future, says she knows who we are. And..." C'mon, Dean. "Jo. Jo's back. In one piece."