You cannot be serious. Can you not see the SUBJECT of the verses? “THAT THE MAN OF GOD”. It’s about SCRIPTURE making the MAN OF GOD a THOROUGHLY perfect workman for God. It has nothing to do with “nothing more can be added to scripture to make it more complete.” Any honest reading of 2 Tim. 3:15-17 should make you re-examine your understanding of what is plainly stated.
Why don't you diagram both sentences for us or would the results be too embarrassing for you?
SO please tell us which books you regard as divinely inspired.
IN what sense are you using "subject"?
I read that "ho tou Theou anthropos" is the subject of a subordinate clause introduced by "ina"="in order that".
(May I interject here that discussing on FR has helped revive my Greek better than 100 courses could?)
The 'construction' question seems to be does "pasa graphe" (I think it's REALLY interesting that Paul uses the singular) contribute to the equipping or alone supply it? I see nothing in the text either way.
BTW, if one looks at verse 15 one SEEMS to find that Paul is referring to "ta heira grammata" (loosely - "the sacred letters") which Timothy has known 'apo Brephous' - "since a child," which might inform the question about which scripture(s) Paul was referring to.
Gotta go; it's time for my brephous. :-)