*cracks necks*
OK, let’s get started…
Question 1:
One must defeat the previous owner to gain mastership of the Elder wand. As it says in the Tale of the Three Brothers…
‘The thief took the wand and, for good measure, slit the oldest brother’s throat.’ (‘??? ?’, ?? ???)
Assuming this story as the final authority on matters relating to the Hallows, we see that with regard to the Elder Wand death is not a prerequisite for ?????. So, as others have answered, simply defeating Draco in battle was enough to gain ownership over not just one, but all wands under Draco’s ????, no matter where they may be.