Its true that most will only accept those players with Gjallarhorn, unless they are acting as a sword bearer in which case there is no need, but that's because players are looking for the most reliable way to get the raid beaten. If you've spent much time in the Crota's End raid on hard mode, you will know that its one of the most hateful things to do in the game. Of all the times i've been in the raid on hard mode, i have only had the desire to see it through to the end once. The reason being is because the damn thing is so full of glitches and bugs that at least 75% of my deaths in it have come about from those bugs and glitches. I could list everything i have seen wipe a team out on all stages of the raid but it would be an extensive list that, quite frankly, i can't be bothered with. My advice. Stick to normal mode. Its not quite as infuriating as hard mode but its at least a bit more tolerable.