And it is necessary This means the Torah needed to mention both their sin and their repentance's acceptance.

If not for the fact that they sinned, we would not have come into the world While Eruvin 13b states it would have been better for man not to have been created, this applies at birth, before one's destiny is known. A righteous person brings blessing to themselves and their generation. Furthermore, our Gemara only means "as if" we hadn't come into the world.

The son of David will not come until the souls in Guf are finished Couldn't these souls be depleted through non-Jewish births? Rabeinu Elazar argues that Jewish and non-Jewish souls are distinct. Regarding Shabbat 30b's statement about daily births in the Messianic era, perhaps those are new souls in new bodies.

For a spirit from before Me will envelop The Messiah is called a "spirit" (Lamentations 4:20). This verse means the Messiah will tarry before God, similar to "The elder shall serve the younger" (Genesis 25:23), due to the souls I have made.

But they lost their possessions They weren't blinded, as Numbers 16:14 mentions their eyes. They weren't lepers, as they dwelled within the camp. Healing at Sinai is irrelevant, as those healed relapsed after the Golden Calf incident. Childlessness wouldn't diminish their influence to slander Moses. Perhaps poverty diminished their power to cause harm, unlike the other afflictions. The plain meaning of the verse refers to Pharaoh's death, as indicated by the preceding phrase.

Ungrateful They are called ungrateful because they refused to say, "You give," not wanting to acknowledge God's benevolence.