Why the mismatch between the Haggada's Dayenu and its summary?

Question

In the Haggada in the part of Dayenu it ends off with

אִלּוּ הִכְנִיסָנוּ לְאֶרֶץ יִשְׂרָאֵל וְלֹא בָנָה לָנוּ אֶת־בֵּית הַבְּחִירָה דַּיֵּנוּ.

If He had brought us into the land of Israel and had not built us the 'Chosen House' [the Temple; it would have been] enough for us.

and in the summary it ends off with

וּבָנָה לָנוּ אֶת־בֵּית הַבְּחִירָה לְכַפֵּר עַל־כָּל־עֲוֹנוֹתֵינוּ.

and built us the 'Chosen House' [the Temple] to atone upon all of our sins.

Why does it add in the part with the Karbonos in the summary and it doesnt mention it in the main part?

Answer 1

It doesn't mention korbanos: it mentions atonement.

I don't know why there's that difference, but I guess the reason is as follows. Atonement is omitted from the poem/song so as to keep the meter and structure. It's added to the followup so as to end on an especially positive note.