Speaking of final word, I never did hear a solid pshat on why the Gemara picked Daniel of all great people of all time.
Some suggestions: Due to his equivalence to Noach and Iyov, that he can survive on his own merits; we find him more than others being very concerned about the Geula, and his many prophecies in this regard; he is a quasi-Navi of Davidic lineage, although not the only one; there is no clear reference to his death, which might suggest a suspension of life waiting to be continued, although he is not unique in this regard; we are told by Mekubalim that his Nevua was of higher origin but a lower plane than all Neviim.