Here's a video of our squad killing Crota in about 4 minutes before spawning ogres. I used a hunter to be the sword bearer with full invisibility specs, and a titan came along with me to drop a shield. I jumped up from the center while invisible for the first run as fast as possible, and went to the rock on the right for the 2nd and 3rd runs,
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Drop sword, blink stealth, pick up sword. Doesn't require running back and forth. Otherwise gj I do the same. And I don't use crouch stealth I use healing on arc blade because I have no red death or orb healing helm.