As I said, the 'Suffering Servant' is the nation of Israel. It is NOT Jesus ─ that's all Christian retrofit. Ask any Jewish scholar or any of the many non-tendentious Christian scholars.
In exact the same way, Jesus is not the "Immanuel" of Isaiah 7:14. You only have to read on in that chapter to see that the child referred to is born and becomes the regional king.
And of course if there's one thing the God of the Tanakh is not, it's triune.
That's simply the author of Luke bringing in parts of the Tanakh that he likes to think can be applied to Jesus.
Right from the first gospel, Mark, the practice of forming the story around episodes in the Tanakh that appeal to the author as "messianic prophecies" is obvious. The most blatant examples are probably those found in Matthew, who, for example:
─ makes Mary a virgin because the Septuagint translates Isaiah 7:14's 'almah 'young woman' as Greek parthenos 'virgin' (even though, as I said, the young lady's son can't be Jesus if you read the chapter) and even though the authors of Mark and John either haven't heard of it or reject it)
─ invents the unhistoric 'Taxation Census' story to get Jesus to be born in Bethlehem to “fulfill” Micah 5:2
─ invents the unhistoric 'Massacre of the Innocents' story to get Jesus into Egypt to “fulfill” Hosea 11.1
─ absurdly sits Jesus across a foal and a donkey to ride into Jerusalem "to fulfill prophecy" (Matthew 21:2-5) in Zechariah 9.9
And do you really think his zombies (Matthew 27:52-53) romped through the streets of Jerusalem and no one else in history noticed such an extraordinary event, not even the other gospel authors?
Yes, anointed by the Jewish priesthood, and there's no sense in which Jesus qualified, being neither a civil, military or religious leader of the Jewish nation.
And I'm looking forward to your explaining to me why the God of the Jews generated two millennia of often murderous Christian antisemitism through Jesus, while having no similar argument with Rome who then ruled the Jewish nation and ignoring much of Europe and all of Africa, India, Asia, the Americas, and Australia altogether.
To carry the authority of the boss is not to be the boss. The Viceroy of India ruled India hands-on but was answerable to the British government of the day, for example. Pilate as Prefect of Judea was in much the same position.