Can the loyal Knights win even if they all die when the game ends?
No, if all the Loyal Knights are dead, the game is lost the instant the last Loyal Knight dies, even if there are 12 or more swords of which a majority are white coming on board when the last Knight dies. There are 4 White swords and 7 Black on the round table. The knights win the Grail quest with Heroism on it, gaining 4 more White swords, for a final total of 8 white to 7 black. Are the loyal Knights victorious? No, because the game should have stopped the minute the 7th Black sword was laid on the round table.