[(Not a heck of a lot more than that, honestly. Maybe just a passing knowledge that he was with Oda Nobunaga for a time.)

What... Are those nicknames...?
But at least Tsurumaru-dono does seem to know some of the others here! Actually--]

The same school as Kogitsunemaru-dono? Then... Ah! You have several who are like family here, then.
Perhaps, you may prefer if one of them introduced you to Honmaru.