Did he have any more reason to take the Wayfinder to the DSII, though?
I feel like he does. I made that distinction in my previous post. He first wanted to push Rey to her limits so that she would tap into her “unlimited powah”. Then he would later try to convince her to come to Exegol with him. Would be risky to bring the wayfinder with him for the first part. I know I wouldn’t if I were him.
And MR, that is somewhat true. Although I’d imagine that if the ship was considered a prototype in TLJ that they would have made at least one more since then in the year gap between films.