Strange is it not.........not one passage from the Old Testament that was presented to you included the name Emanuel as a subject matter (It appears that you have preconceived COOKIE CUTTER response to the fact that the Messiah is addressed by the Old Testament prophets. One parroted link cures all....no?
........just as the name Jesus is not mentioned in the scripture presented to you. Do you know why? In the Aramaic alphabet the Lord's name transliterates to "YESHUA". Jesus was born, lived as Jew, worshiped as a Jew and carried a name common to the Hebrew tongue.....which was not JESUS, Jesus would be called by a Hebrew name Yhoshua. Jesus grew up in the Galilee region and would have spoken Aramaic and He would have never heard the name "JESUS". The Syriac translations of the N.T. spell out the name "Yeshua".
You forget? The N.T. was not written in Hebrew/Aramaic/Syriac............it was written in the Universal language of the day, Koine Greek......and the English Translation ....i.e., JESUS comes from the LATIN, which is based on the Greek which in turn is based upon the original Aramaic Alphabet.
Often.........Prophecies in the Old Testament have dual meanings, Such as the prophecy of Isaiah in relation to prophecies concerning kings. A prophecy could have both a short term and a long term meaning. Example: Isaiah's prophecy concerning a "Virgin Birth".........had a short term partial fulfillment when Isaiah informed Ahaz he should look for the sign of a Virgin giving birth (Isaiah 7) But the Virgin would give birth to a son but before the boy knows enough to reject the wrong and choose the right path Israel and Aram would be destroyed .........that was the Near prophecy. The long term prophecy of Daniel 7......Matthew connects the prophecy to the virgin birth of Jesus (Matthew 1:23)
Another example are prophecies presented to King David........the short term would be the generation when "Solomon" would become king of David throne in "Flesh and Blood"........Solomon would become king and build the temple of prophecy .....long term, Samuel the prophet declared that a king from the lineage of David would establish an everlasting kingdom. Solomon's kingdom was not eternal......nor was the temple. (2 Sam. 7:11-13) The we find the angel "Gabriel" declaring this about the eternal kingdom of the Christ "The Lord God will give Him (the Messiah, king of the eternal kingdom) the throne of his father David and he will reign over Jacob's descendants FOREVER; HIS KINGDOM WILL NEVER END (Luke 1:32-33)