My team and I have combined the little techniques of all the current strategies and came up with a great way to kill Crota.
The purple bubble strategy is no longer needed, as in the video we have one person go to a certain spot and shoot at the wall so the Knights look at him. If he does not shoot, you and your team are in danger because the Knights will agro on the sword.
This is also the sword POV of me on my warlock. Go ahead and copy this strategy! Super easy.
http://youtu.be/1TkM1dvi1e8
EDIT: Yes, you [i]can[/i] be a swordbearer without being a bladedancer Hunter. It just takes some skill and a well oiled team.
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You don't need to do anything special like that for boomers. The guy doing boomers can stand in the middle with the rest of the team and snipe at them a couple times at the beginning of each sword. That way he can switch to his launcher and fire at crota if needed.