Even if I am against anything that helps division between players, I will agree that the party leader is King on Party Finder group, and s/he have all rights to decide how the party is composed.

Anyway, as long as s/he already can check players on lodestone, will not agree on implementing things meant to encourage player division: if leader wants be sure about the kill, s/he needs make the extra effort on it.

About players that enters PF without the description requirements, it always happens and it is not only related to this case. You can kick then and yes you wasted time, but happens. We still far from a perfect world. And this will happen again even if that checkbox have been implemented, because as you already have noticed, there are players that got carried. And they are really a lot, because that "selling primal kills" business seems so profitable as long as so much players are doing it. Blame them both (sellers and buyers).