It's a word game attributing various qualities to the term "descended". It's not productive, because it leads to labyrinthine conjecture. Language has this nature, because in different connotation many words can seem the same but have very different implication. The questions proposed are sound, but not stated precisely, perhaps intentionally. You might get better answers exchanging "created" for "descended".
Will you come to the conclusion "because God created Satan" and "God created mankind", then Satan is somehow the "brother of mankind"? No. No more than a "wall I manifest on a house" is the brother of a "wall I manifest on a school". These constructs are not my descendants.
The obvious discrepancy from the original post here is "Did Jesus descend from God?". Yes, in a way, but no in a way. The "value" of the term "descended" does not apply as a "logical" derivative. It's simply an improper notation, it is "bad math". The answer lies somewhere in "the nature of God", which to us is indefinable, or "empty set".
