And Peter says, "Paul's letters and the rest of the scripture"
Your "quote" isn't a quote or a paraphrase as it is not even in the New Testament. I know what you're trying to do, though. You're trying to make 2 Peter 3:16 fit your doctrine. Here's what the verse actually says again. I'll even add some of my words in green brackets.
2 Peter 3:15,16 NASB
15and regard the patience of our Lord
as salvation; just as also our beloved brother Paul, according to the wisdom given him, wrote to you,
[in his letters]
16as also in
all his letters, speaking in them
[Paul's letters] of these things, in which there are some things
[his letters] that are hard to understand, which the untaught and unstable distort
[they distort Paul's letters], as
they do also the rest of the Scriptures
[not Paul's letters], to their own destruction.
Seems pretty clear he says 'other' or 'the rest of' for good reason. That is, he's equivocating Paul's epistles with scripture.
If he wasn't doing that why would he say 'other'?
The "other" or "rest of" means
all of. You want to make it mean that Paul's letters are scripture, too, but that isn't what Peter said. You really should look at how the word "other" is used. It isn't used to put two unlike things into the same group as you seem to be trying to do.
We aren't talking about a translation issue here. That word 'other' is definitely in the Greek.
What are we talking about then? You have a verse that has the word "other" in it and you hang your hat on it that Paul's letters are sripture. Really that's a rather weak argument, but it's the best one you have; I get it!
Okay let's play your game. Are James's letters, Peter, Jude, John, Luke, Matthew, and Mark scripture too? Where is the verse from an apostle that calls their writings scripture?