"Can you support this with a scriptural argument, or is this just your opinion?"
Daniel
10:10 And, behold, an hand touched me, which set me upon my knees and upon the palms of my hands.
10:11 And he said unto me, O Daniel, a man greatly beloved, understand the words that I speak unto thee, and stand upright: for unto thee am I now sent. And when he had spoken this word unto me, I stood trembling.
10:12 Then said he unto me, Fear not, Daniel: for from the first day that thou didst set thine heart to understand, and to chasten thyself before thy God, thy words were heard, and I am come for thy words.
10:13 But the prince of the kingdom of Persia withstood me one and twenty days: but, lo, Michael, one of the chief princes, came to help me; and I remained there with the kings of Persia.
10:14 Now I am come to make thee understand what shall befall thy people in the latter days: for yet the vision is for many days.
10:15 And when he had spoken such words unto me, I set my face toward the ground, and I became dumb.
10:16 And, behold, one like the similitude of the sons of men touched my lips: then I opened my mouth, and spake, and said unto him that stood before me, O my lord, by the vision my sorrows are turned upon me, and I have retained no strength.
10:17 For how can the servant of this my lord talk with this my lord? for as for me, straightway there remained no strength in me, neither is there breath left in me.
10:18 Then there came again and touched me one like the appearance of a man, and he strengthened me,
10:19 And said, O man greatly beloved, fear not: peace be unto thee, be strong, yea, be strong. And when he had spoken unto me, I was strengthened, and said, Let my lord speak; for thou hast strengthened me.
10:20 Then said he, Knowest thou wherefore I come unto thee? and now will I return to fight with the prince of Persia: and when I am gone forth, lo, the prince of Grecia shall come.
10:21 But I will shew thee that which is noted in the scripture of truth: and there is none that holdeth with me in these things, but Michael your prince.
Daniel
12:1 And at that time shall Michael stand up, the great prince which standeth for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book.
Revelation
12:7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
12:8 And prevailed not; neither was their place found any more in heaven.
12:9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
2 Thessalonians
2:6 And now ye know what withholdeth that he might be revealed in his time.
2:7 For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way.
2:8 And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming:
2:9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders
2:10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
2:11 And for this cause God shall send them strong delusion, that they should believe a lie:
2:12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
Michael's mission is to stand for Israel, past and present, and this archangel will be involved with the casting of Satan and his fallen angels to the earth and baring them from access to heaven during the coming tribulation
So he is not the restraining force that prevents Satan from operating in the open during the coming tribulation .... the restrainer against Satan is always the Lord's holy spirit
Only the Lord has the power to constrain the devil from destroying humanity and the earth
Satan has tried many times to completely deceive and destroy humanity and has always failed because the Lord has him on a tether
When the tribulation comes, the Lord will lift His restraint, stand aside, and will let the devil have his way for a short period .... if not shortened, Satan would succeed in his ambition
So because the earth dwellers at the time will have refused to believe the truth about the Lord, He will give them the devil in order to punish them for their intransigence [Revelation 12] .... then He will turn on Satan and restrain him fully in the abyss for 1000 years so that he cannot deceive the mortals of His millennial kingdom [Revelation 20:1-3]