Question: The Gemara always implies that Nevi'im are better than Kesuvim, as stated in Megilah (31a), "This is stated in the Torah, said again in Nevi'im, and a third time in Kesuvim." This implies the Pasuk was first stated in the Torah, and later in Nevi'im.

Answer: The Pesukim in Tehilim, Mishlei, and Iyov preceded the Pesukim of Nevi'im.

Implied Question: Our custom is to finish with Pesukim from the Torah. (Why do we do so?)

Answer: This is because we hold like Rebbi Yosi, as he states in the Gemara, that one who finishes with Pesukim from the Torah is efficient and praised. This is what the early ones did.

Implied Question: Even though the decree of this king has been nullified, we do not reinstitute the practice of blowing Shofar during Shacharis even though it would seem better to do so because of Zerizin Makdimin l'Mitzvos (we do Mitzvos as early in the day as possible). (Why don't we blow nowadays during Shacharis?)

Answer: This is because we suspect that the decree will come back again.

Observation: According to the explanation of the Yerushalmi this is understandable. The Yerushalmi explains that the enemies thought that the Jews were gathering to sound a Teruah of war, and they therefore came and killed them. This is why they instituted Tekios and blessings specifically in Musaf, as if the Nochrim would first see them saying Shema, Shemonah Esrei, reading the Torah, and then saying Shemoneh Esrei again they will realize that they are just following their customs, meaning their laws and Torah (and not declaring war on the Nochrim). (This reason applies today as well.)