Speaking of which, let's not forget either that the beast and the false prophet get thrown into the Lake of Fire after the final Great Tribulation and before the 1,000 years of peace. Satan doesn't get thrown into the Lake of Fire until after the 1,000 years are over.
If we set aside all systems and simply ask,
"What does Scripture actually say?", then the answer is more limited than either futurists or preterists sometimes admit.
Scripture clearly teaches that there is a
"man of sin" or
"man of lawlessness" in 2 Thessalonians 2:3-4.
Scripture also clearly teaches that there is a
beast in Revelation 13 and a
false prophet associated with him in Revelation 13:11-18 and Revelation 19:20.
Scripture further teaches that there are
many antichrists and that the spirit of antichrist was already present in John's day (1 John 2:18; 1 John 4:3).
What Scripture does
not explicitly say is that all of these figures must be one and the same individual.
Likewise, Scripture does not explicitly say, "There will be one final world ruler called The Antichrist."
In fact, John never uses the term "antichrist" for the beast of Revelation.
That connection is an inference made by comparing passages, but the text itself never states it.
Regarding the timing of the man of sin, Scripture says he would be revealed before the day of the Lord (2 Thess. 2:3).
Whether that revelation is still future or already occurred is the very point under dispute.
The passage itself identifies the character and actions of the man of sin, but it does not directly say, "This occurs after a pre-tribulation rapture," nor does it say, "This was fulfilled in the first century."
As for Revelation 19, the text certainly presents Christ riding the white horse in judgment.
The question is whether that vision describes His final universal return or a historical judgment.
The chapter itself calls Him "King of kings, and Lord of lords" and depicts the beast and false prophet being cast alive into the lake of fire (Rev. 19:20-21).
The text records the event but does not directly answer every timing question people ask about it.
So if we stay with Scripture alone, the safest conclusion is:
The Bible teaches a man of sin.
The Bible teaches a beast and a false prophet.
The Bible teaches many antichrists.
The Bible never directly states that all of these are the same person.
The Bible never explicitly uses the title "The Antichrist" for the beast.
The Bible does not plainly state that there will or will not be a single evil world ruler immediately before the end.
Therefore, unless additional passages can be shown to directly connect these figures, neither "there must be one future world dictator" nor "there definitely cannot be one future world dictator" can be established by explicit biblical statements alone.
That is where interpretation begins and where certainty should be held with caution.