1)
Why does it say "Bnei Apayim"? There is only one!
1.
Malbim: Ezra copied his Sefer from the great Sefer of lineage. It listed many Bnei Apayim, and among them Yish'i. Ezra wrote u'Vnei, like it said there.
2)
Who was Achlai?
1.
Refer to 2:34:1:1-2.
