Oh, poor soul, he's in Five. He wonders if Sam is aware of the ongoing yogurt conflict yet but decides he probably shouldn't ask. It's not something he feels anyone could really adequately explain. You just have to see it in action.

"Signless," he says, holding out a hand (and dislodging several tribbles in the process) to shake. "Several of my friends are in Five. Have you met Kankri yet?"

'Friend' is simpler than 'alternate-universe younger past life', okay.