1)
Why does it say "Ekah Shemaya"?
1.
Ibn Ezra: There is no Chacham in the land who can know this.
2)
Why did he mention "Im She'ar Chakimei Bavel"?
1.
Malbim: This is like "Al Te'asef Im Chata'im Nafshi." We find that Tzadikim request not to perish with Resha'im (Tosefta Sanhedrin 9:3).
