Gabriel was specified by "the voice of a man calling from between the banks of the Ulai," and Daniel specified of Gabriel in chapter 9, "the man I had seen in the earlier vision (v.21). There is no referral for the one speaking in chapter 10 except to the man with the eyes like flaming fire. Is there any biblical instance where these eyes are attributed to anyone other than the Son of God as in Revelation 2:18?
Look again, lest you have the Son of God (clothed linen) being less knowledgeable in prophecy than others.
Daniel 8 is tied to Daniel 7 and the span of time there, just as Daniel 8 is tied to Daniel 9 and the time there:
Daniel 8:1 In the third year of the reign of king Belshazzar a vision appeared unto me, even unto me Daniel, after that which appeared unto me at the first.
Daniel is very chiastic, not only in chapter, but so in verse, for instance, in Daniel 8:1, the chiasm reads [brackets in bold added for helpful clarity]:
[A1] “In the third year of the reign of king Belshazzar ...”
[B1] “... a vision appeared ...”
[C1] “... unto me [Daniel] ...”
[C2] “... even unto me Daniel ...”
[B2] “... after that [vision] which appeared unto me ...”
[A2] “... at the first [year of the reign of king Belshazzar, in Daniel 7:1].”
Daniel 7:1 In the first year of Belshazzar king of Babylon Daniel had a dream and visions of his head upon his bed: then he wrote the dream, and told the sum of the matters.
Further comparison:
Compare:
"then was I in a deep sleep on my face, and my face toward the ground" in Daniel 10:9,
to Daniel 8:18 "I was in a deep sleep on my face toward the ground"
Compare:
"I am come for thy words" in Daniel 10:12,
also "sent" in Daniel 10:11
to Daniel 9:21 "being caused to fly swiftly"
and Daniel 9:22 "And he informed [me], and talked with me"
and Daniel 9:23 "I am come to shew [thee]"
and Daniel 8:17 "So he came near where I stood"
Compare:
"hand touched me" in Daniel 10:10
to Daniel 9:21 "touched me"
and Daniel 8:18 "he touched me, and set me upright"
Compare:
"understand" in Daniel 10:11-14
to Daniel 9:22 "skill and understanding"
and Daniel 9:23 "therefore understand the matter, and consider the vision."
and Daniel 9:25 "Know therefore and understand"
and Daniel 8:16 "make this [man] to understand the vision"
and Daniel 8:17 "Understand, O son of man"
and Daniel 8:19 "Behold, I will make thee know"
and Daniel 7:16 "So he told me, and made me know the interpretation of the things."
Compare:
"for from the first day that thou didst set thine heart"
and "to chasten thyself before thy God"
and "thy words were heard" in Daniel 10:12
to Daniel 9:23 "At the beginning of thy supplications the commandment came forth"
and Daniel 8:15 "sought for the meaning"
and Daniel 7:16 "asked him the truth of all this"
and Daniel 7:19 "Then I would know the truth of the fourth beast"
Compare:
"O man greatly beloved" in Daniel 10:19
to Daniel 9:21 "for thou [art] greatly beloved"
Compare:
"like the appearance of a man" in Daniel 10:18
to Daniel 9:21 "even the man Gabriel, whom I had seen in the vision at the beginning"
and Daniel 8:15 "behold, there stood before me as the appearance of a man"
and Daniel 8:16 "Gabriel"
and Daniel 7:16 "one of them that stood by"
Daniel 11 parallels Daniel 8. Gabriel was sent back to complete in detail what was incomplete in Daniel 8.