Perhaps a bit too much is being made out of the word "emanate". Take a look at the Hebrew of Redak's comment. It doesn't have the word for emanation there. It literally restates verse 1 word for word. Then cites Targum Jonathon. Here's the text of Redak's comment from sefaria:
והיה שרש ישי. פי' היוצא משרש ישי, כמו שאמר ונצר משרשיו יפרה, כי ישי הוא השרש, וכן תרגם יונתן בר בריה דישי:
Emanation is some derivative of
Klein Dictionary, אצל ᴵ 1. Besides using process of elimination and comparing the words in verse 1 and verse 10. Emanation is not really in the comment.
The context going into Isaiah 11:1 says that the Lord is going to cut down the haughty and they shall be humbled. He (the Lord) shall cut down the thickets of the forest (the nation of Israel) with iron, and the Lebanon shall fall by a might one. The "Lebanon" speaks of the temple (Yoma 39b):
Rabbi Yitzḥak ben Tavlai said: Why is the Temple called Lebanon [Levanon]? Because it whitens [malbin] the Jewish people’s sins, alluded to by the root lavan, meaning white.
Josephus prophesies to Vespasian that he (Vespasian) will become king since only a "mighty one," i.e., a king, would fell the temple in Jerusalem. Since Vespasian destroyed the temple, Josephus, based on Isaiah 10:34, prophesies, correctly, that Vespasian will become the emperor of Rome.
In Isaiah 11:1, immediately after the temple is felled by Vespasian, Isaiah tells us not to worry too much since out of the stump of Jesse (Judah being the kingly branch, tribe, scepter) will come a rod חטר, a basal-shoot גזע, and this right out of the roots of the stump (of the temple). Though Israel, and the temple, are razed to the ground, leaving nothing but a stump (C.E. 70), nevertheless, king Messiah will rise, not from the second temple, but out of its stump.
Thus speaketh the Lord of hosts, saying, Behold the man whose name is the Branch צמח; and he shall shoot יצמח up out of his place And he shall [re]build the temple of the Lord. . . And he shall bear the glory.
Zechariah 6:12.
In Isaiah 4:2, the prophet uses the same word, צמח, to say:
In that day shall the Branch צמח of the Lord be beautiful and glorious.
Jeremiah 33:15 says:
In those days, and at that time, I will cause the Branch צמח of righteousness to sprout up צמח, unto David; and he shall execute judgment, and righteousness, in the land.
Judgment is associated with the king, while righteousness is the priestly work of the temple. Messiah is both, ala Jeremiah 33:15, and Zechariah 6:12. Ironically, in the next verse of Jeremiah, 33:16, the prophet says Judah (i.e., the sprout out of Jesse) will be Yesha תושע. ------Yesha, or Yeshua, "Salvation," will be the sprout צמח out of the felled temple (and out of the stump --the felled tree of Jesse). King Messiah will be a savior, salvation, Yesha, or Yeshua, and or a Nazar (Isaiah 11:1), that is, "Yeshua the Nazar
ene." Which is to say that Isaiah and Jeremiah add important information concerning this messianic fella whose name is "Branch," or more specifically, "virgin's-sprout" צמח. -----Not only will he be known as a virgin basal-shoot צמח growing out of the root שרש of the temple (and out of the stump of Jesse's
brit milah), but he'll actually be called "Yesha the Nazar-
ene" ישע נצר ("salvific branch"). The Talmud calls his followers "Nazarim."
Isaiah, Jeremiah, and Zechariah, not only fall all over themselves to relate that King Messiah will be called by a name associated with a virgin sprout צמח out of the roots שרשי of otherwise sexual shenanigans, but all three of them are dying ---at the hands of haughty Israel --- to spit out the name "Yeshua the Nazarene" as the
hidden נצרית (Isaiah 48:6) identity of King Messiah.
John