I think we might be talking about 2 different things here.
Example A:
Jiggs at 1 stock
Falcon at 2 stock
Jiggs rests falcon.
falcon dies.
falcon is at 1 stock.
falcon respawns.
jiggs is sleeping due to rest.
falcon kills jiggs while she sleeps.
falcon wins the game.
100% totally certified win for falcon. no complaints at all.
Example B:
Bowser at 1 stock
Marth at 1 stock
Bowser hits marth with Klaw
Both characters die
Bowser should get the win.
Why? Bowser initiated a move that was a guaranteed kill move for bowser. To disagree with this is to disagree with any character landing a kill move on any opponent. it doesnt make sense.
But you're trying to invent an award for this move that doesn't exist in the game. Bowsercide is useful on first stock when you're at higher percentage than them and not at a deficit. The game rewards that.
The game does not reward Bowsercide on last stock.
Okay, better analogy.
Bowsercide is basically identical to a suicidal edgeguard that guarantees the opponent's death after you. For another Melee example, imagine Falcon going way offstage after a Falco player with an unsweetspotted knee that puts Falco too far away to recover. Falcon will die, first, but Falco dies too.
On Falcon's first stock, if he's got a higher percentage, or if he's up a stock, this is a great move.
If it's Falcon's last stock, however, it's a bad move, because he will die first (since Falco can shinestall) and the game awards him the win.
We don't award the Falcon a win for a suicidal edgeguard on last stock (even if it's a good move on the first stock!) in Melee, even if he initiated the situation.
Falcon initiated a move that was a guaranteed kill move for Falcon. But he knew the game would award the win to the opponent. So he should have known better.
Why would we make a rule to award Bowser the win for a suicidal finish the game tells him not to do if we don't reward people for suicidal edgeguards?
Knowing "I can't finish the last stock with a Bowsercide even if it's good on the first stock" is exactly the same as knowing "I can't finish the game with a suicidal edgeguard that kills me first even if it's good on the first stock."