Only exotics earned in this game are Thorn,bad juju,super good advice,pocket infinity,invective and fate of all fools when they finally release it every thing else is just pure luck or you get it it from xur plain and simple
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And Necrochasm
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Nope that's still RNG and you can still be carried through hard Crota (I've carried one of my irl friends not to long ago)
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Though the crux and husk of pit is rng, you still have to grind the kills to get the Ally, and level up the Ally... So yes and no.