You're looking for an exotic explanation that need not be. The antichrist, aka the beast, the man of sin, comes in peaceably, at first, Daniel 11, will be like Hitler in his rise to power, extremely popular, a great orator, somehow managing to affirm a world covenant involving Israel, Daniel 9:27, which many believe will include their temple and temple worship, 2 Thessalonians 2:4. He is the rider on the white horse, will seem like a savior of the world, for a time. As to relegating any of the horses to the past, it is Jesus Christ who opens the seals which begin the tribulation, in the presence of redeemed saints, Revelation 5 and 6. As we speak, the tribulation hasn't yet begun, the antichrist has not been revealed, 2 Thessalonians 2:3, so exotic interpretations, trying to place the horses in some past historical context, don't work. As to the other horses, scripture is clear the antichrist becomes a warrior, the peace short lived, by the middle of the tribulation he invading Israel, the abomination of desolation in the temple and the great tribulation, latter 3 1/2 years of Daniel's week ensues. The other three horses are the natural course of destructive wars, famine, death and all its upheaval, an exact description of the slide into hell, from fake knight on white horse to hell on earth.
A fourth of the earth's population is mentioned as being slain, Revelation 6:8. This is death resulting from the sins of the antichrist, which lead to war, which lead to famine, and, ultimately, death, a chain reaction: sin causes hatred, hatred causes war and bloodshed, war brings famine, famine produces death, and, after death, comes hell and the judgment. Often, the aftermath of war brings more death, by famine and disease, and we have biological warfare. A smart theologian once pointed out an interesting theory, if you want to entertain theory, this theory close to home in common sense. Regarding Revelation 6:8, one of the most destructive creatures on earth is the rat, a menace to human health and food supplies, a nasty creature coming in over 100 species, producing five or more litters of 8-10 new rats per year, over one billion dollars in food lost in the U.S. due to rats per year, their fleas carrying bubonic plague, which destroyed 1/3 the population of Europe in the 14th century, and typhus killing an estimated 200 million people in four centuries, this disease also carried by rat fleas. Think of how favorable the environment for rats will be, a vertiable feast, in the wreckage and rot war leaves in its trail.
Anyway, like stuffing news headlines into prophecy, stuffing history, with such specificity, into Bible prophecy is always dubious or outright wrong, lacking proper foundation in scripture harmony, and that harmony where we should derive our interpretations from, avoiding private interpretations. It's better, if nobody knows, like, for instance, the identity of the antichrist, it's best not to even address the subject, than to be a false prophet, creating "thus saith the Lord" where the Lord has not spoken, Ezekiel 22:28, Jeremiah 14:14, Jeremiah 23:21, Jeremiah 23:25. Again, since the horses have not ridden, unless one is a Preterist or Amillennialist, that is, completely out to lunch, the events of the seals are yet future.
Just a suggestion, but when you post something so exotic, isn't it reasonable to expect you to show some scripture evidence, since everybody who knows anything seeks for the Bible to interpret the Bible? If there's, in fact, nothing in scripture to substantiate the claims, isn't it proper to state you saw something really weird, don't know if it's true, that you have this theory, or the like, but, again, also offer a why from God's word? It's impossible to say that you see these things in your list, in the text of Revelation 6:1-8, this much clear.
