"But if he died... perhaps others would follow in his footsteps" - sure, there's this part about a worthy cause in between these parts, but even with it, I still read it like that. It sounded like he wanted them to die.
"As faint as the winter sun" - nice line
I'd say "if my knowledge can be still relied upon" might sound better, but it may also be too long.
The part about her curiousity works way better.
"would at least not mean they were sure" - it may be me, but imagine reading that out loud in front of a crowd in one, fluent take. It does sound a bit overcomplicated, doesn't it?
Part about the branches under his weight works fine
The long sentence at the end with "(...)he who... in order to(...)" feels strangely incomplete. I think it may be because of "he". It sounds strange when you couple it with "She'd known... he". Maybe try "She'd known him for so long, the person who..." If you start it with "he who" is seems to begin a completely different kind of a sentence.
That's all. Good job on the edits!