Crowley offered a shrug of acknowledgment, wry acceptance that not everyone had someone that willing. Though really, he had. Kol, his family, Loki, even Superkid, they had all come through to save him when Lucifer had taken him. "I reckon the closer the connection is, the better," he agreed. "Some of them will be obvious, like those Winchester boys, Rebekah will have her various brothers, Rose will have a list, the succubus has at least two who'd do it. Not even sure I have the complete list yet, but I reckon the majority will have someone important."
He looked again at the pages, even though nothing on them had changed in all the times he'd read it. "The blood is the vital part, made stronger by the strength of the connections. So it'll be better if there is a big link, but should still work if there are a couple of people without friends, as long as someone represents them." And well, it was Lawrence, there were heroes around who would do it.
As for the archangels, that was more difficult. "I'm hoping that you and Jules can help keep Lucy and Mickey at bay. You two would stand for the boys, you'd be calling to them, not their angelic hitchhikers."
That was the theory anyway. It was all theory and guesswork, but at least it was educated, because Crowley was, well, one of the smartest around. He had to be. King of the Crossroads, he had a gift for seeing things in people, what they needed, what they wanted, all those secret desires they kept hidden away. One didn't learn how to read and potentially manipulate humanity without being incredibly smart.