Literal answer... I don't suppose he means Bandomino, the guy who wrote the scrolls?
Saar just told us the name, so he knows we know about it, and when he says three people went on the journey he could mean that Bandomino went first and Adelmo and Kuylen followed in his footsteps many, many years later.
Saar already said he didn't go, and he'd count as only going with Kuylen even if he did, not as a whole other interest.
You've all sen it- it;s nothing awkward. it's just too obvious for any of you to say because I am trying to guide you form the basics upwards to give an idea about how Saar functions.
Anything you have said to Saar is supposition to him- what's the only thing he KNOWS about you and your current activity? I mean 'current' quite literally., Being literal is the way to answer this.