If only Premils understood that Abaddon/Apollyon, the angel who is the king of the locusts which symbolically represent fallen angels, is another name for the devil/Satan, they would be able to see that the dragon, Satan, will come out of the abyss at the fifth trumpet (Revelation 9:1-11).
Fallen angels have no other king besides Satan, which is why verses like Matthew 25:41 and Revelation 12:9 refer to all fallen angels as "his angels" (Satan's angels). So, Abaddon/Apollyon has to be another name for Satan. And the idea of him being known by other names should not be hard to grasp. We know he has other names such as Lucifer, Baal and Beelzebub. So, why not Abaddon/Apollyon as well?
Let's start from this angle.
Mark 3:24 And if a kingdom be divided against itself, that kingdom cannot stand.
Luke 11:18 If Satan also be divided against himself, how shall his kingdom stand? because ye say that I cast out devils through Beelzebub.
Next let's look at this in Revelation 9.
Revelation 9:4 And it was commanded them that they should not hurt the grass of the earth, neither any green thing, neither any tree; but only those men which have not the seal of God in their foreheads.
5 And to them it was given that they should not kill them, but that they should be tormented five months: and their torment was as the torment of a scorpion, when he striketh a man.
And to them(these locusts that come out of the pit) it was given that they should not kill them(men which have not the seal of God in their foreheads), but that they should be tormented five months: and their torment was as the torment of a scorpion, when he striketh a man.
Next let's factor in the following.
Revelation 13:7 And it was given unto him to make war with the saints, and to overcome them: and power was given him over all kindreds, and tongues, and nations.
How does--tormenting men which have not the seal of God in their foreheads--equal---to make war with the saints, and to overcome them?
Why would satan be attacking his own people and tormenting them? Would that not be an example of satan being divided against himself? How does it benefit satan and his kingdom to have men tormented which have not the seal of God in their foreheads? That accomplishes exactly what for satan and his kingdom?
Clearly, IMO anyway, what the locusts are being commanded to do and to not do, God is behind the reason why, not satan.
Since Revelation 9 is using imagery involving locusts, locusts fall under the category of plagues if involving swarms.
Revelation 11:6 These have power to shut heaven, that it rain not in the days of their prophecy: and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will.
and to smite the earth with all plagues, as often as they will---which could mean that it is the 2Ws that are commanding the locusts to do what they are to do, torment men which have not the seal of God in their forehead. Right or wrong, at least it sounds more plausible than satan commanding the locusts to do things not beneficial to him. I'm not implying this makes the 2Ws the king over the pit, though.
Plus, nowhere in Revelation 9 does it ever state that the king of the pit is in the pit when the locusts are, and that when the locusts emerge from the pit, so does the king of the pit.
How does it make good sense that if satan is the king of the pit, the same pit he is the king of, it manages to imprison him? That would be like saying the warden of a prison, the prison manages to imprison him in the same manner other prisoners are imprisoned there.