It is apparent that your conclusion has been reached before your study of the scriptures on the matter and so you will keep searching until you find a verse that you think supports your preconcieved notion. This is called eisegesis. Not sure where you are getting that they are talking about the same individual leading. The first is speaking of the casting out of the angels from heaven. The second one is speaking of the second coming of Christ. It does not say that the individual on the horse is an angel. Jesus is not an angel. Sorry.
Heb 1
6: And again, when he brings the first-born into the world, he says, "Let all God's angels worship him."
7: Of the angels he says, "Who makes his angels winds, and his servants flames of fire."
Heb 1:
13: But to what angel has he ever said, "Sit at my right hand, till I make thy enemies a stool for thy feet"?
14: Are they not all ministering spirits sent forth to serve, for the sake of those who are to obtain salvation?
He said what he has not said to any angel to his son, Jesus Christ. Christ is not an angel of any kind.
We should also remember that Heb 1 carries on in to heb 2. Actually when the Bible was written there were no chapter separations. So let's carry on Pauls thought. The word therefore indicates that Heb 2 is a continuation where Paul is drawing conclusions from hebrews 1.
1: Therefore we must pay the closer attention to what we have heard, lest we drift away from it.
2: For if the message declared by angels was valid and every transgression or disobedience received a just retribution,
3: how shall we escape if we neglect such a great salvation? It was declared at first by the Lord, and it was attested to us by those who heard him,
4: while God also bore witness by signs and wonders and various miracles and by gifts of the Holy Spirit distributed according to his own will.
5: For it was not to angels that God subjected the world to come, of which we are speaking. 6: It has been testified somewhere, "What is man that thou art mindful of him, or the son of man, that thou carest for him?
7: Thou didst make him for a little while lower than the angels, thou hast crowned him with glory and honor,
8: putting everything in subjection under his feet." Now in putting everything in subjection to
What an opportunity Paul had here to identify Christ as an angel. He did not however.
God did not subject the world to come to angels. How clear is that? Very. He did subject it to his son who for a little while was made lower than the angels by becoming a man. Jesus Christ is Lord and God! To him, be all glory, praise and honor forever, AMEN!