That statement caused Obi-Wan to give the Mandalorian a bit of a strange look. He had never heard of such a thing, and he had known quite a few Mandalorians. This one seemed like an odd one. Before he can ask though, Mando asks his own questions, and the man hesitates for a moment. It's the genuine earnestness, and lack of hostility that gets him to answer.

"I was, yes. In fact, I come from the same place as Grogu. I knew of him. From a distance at least."

The Jedi Temple had been a big place, but having been on the High Council, he knew a lot of what had gone on. And the fact that there was a youngling just like Master Yoda was not something that could be easily forgotten.