1)
How does this Pasuk follow the sequence of events?
1.
Seforno: Having fulfilled the command to convey to Yisrael what Hashem had told him,
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he now fulfilled the command to carry out what he had to do.
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See Yisro, Sh'mos 20:22 (Seforno).
2)
Why does the Torah not list the naMeis of the seventy elders?
1.
Rosh Hashanah, 25a: To teach us that every group of three who is appointed Beis-Din in Yisrael is comparable to the Beis-Din of Moshe.
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Whose identities are unknown and who, for all we know, were not greater than the current Beis-Din.