[Sam wasn't sure if he was being told something he wanted to hear or if it was really lining up that easily into something tangible, something they could at least figure out. Having the pattern was a start.]

Could be a chance to unearth something of a solid lead on Dad too. [Look, he knew that Dean was dedicated to that search and if it whatever was leading them onto a new case would push them toward their father - Sam might not be thrilled with the idea, but he wasn't going to not admit it could help.]

If this thing has to do with Mom, he'd have his hand in it too.