2. Yes.
3. Consider "consider" for 考える. Everything else you have right, unless I missed something.
4. 因果関係の全体を確認して述べる -> cause-effect relationship's whole (obj) confirm (then) state. So it's "state something after having confirmed the whole of the cause-effect relationship," basically.
By the way, about から, I believe it basically marks a starting point of any type, so in 本文の内容から考えて, it's like "with the content of the text as a starting point, consider..." Does that help at all?