1)
Why does the verse teach about Ram first?
1.
Malbim: It is due to the lineage of Beis David, which comes from him. In each generation, Ezra taught only the son from whom David descends.
2)
Why does the verse teach that Nachshon was Nasi of Yehudah?
1.
'Rashi', Radak: It is for the honor of Beis David.
