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You should notice that "last plagues" does not automatically mean "last wrath"; the 'Wrath' is "contained" in the [ seven ] "last plagues" --- there is a difference...
[SUP]1[/SUP] And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up the wrath of God.
Look up the Greek words that make up that last phrase. You should find that the "sense and tense" of the words "for in them" show something that is "completely and fully inside" ( not part of something that also has a part that is "outside" ).
This is why I say:
'vials' => "wrath"
Yes - there are other plagues; however, this verse defines these seven last plagues, collectively, as the Wrath of God. They are separate from the 'trumpets' in this specific regard.
The phrase "is filled up" comes from a single Greek word, and is a verb.
There is no concept of "the last of the wrath" in this verse; rather, it is defining "all of the wrath", collectively, as being "contained" in the seven last plagues, collectively.
The word 'last' in this verse only applies to the plagues. It does not apply to the wrath.