Kanan damn near knocked over the kettle at that, turning on his heel to look at the--

Pureblood Sith. There was something he'd never encountered before. They were a race long, long gone by his time, bred out by human Sith looking to create children who were stronger in the Force. He swallowed, reeled in his shock hard, and then lifted his chin and looked at the Sith with an expression a little too calm.

So, that answered roughly where in the timeline Lana could have come from, right there.

"Jedi Jarrus, yes," he replied, not offering up the fact that he was a Padawan, no. No way. "I take it you're Lana's guest?"

Wild guess.