Theory time: The other “mandalorians” that the frog lady’s husband claimed to have seen are actually Sabine and Rex.

Theory 2: Mando learns (probably through Sabine) that not all Mandalorian sects keep their armor on 24/7 and that the armor shouldn’t define them. Then at the end of the season Boba catches up to him and explains the sentimental value of his armor (since it used to belong to his dead dad and whatnot), and then Mando gives it back to him, which would be a solid setup for the Boba show that was recently confirmed.

EDIT: Ah wait I forgot that Bo-Katan is already confirmed for the show too. Add her to my theory above.