Have done both the Gally and the actual method. Killing the Eye and dealing damage after detainment isn't all that difficult. The problem is with the Eye and his ability to play nice, much like the swordbearer in crota. If all goes well, the Eye will funnel towards you, just as the swordbearer would stay middle. That is the only problem our group encountered.
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Try a 365 fast firing shotgun next time, you won't need the jail breaker buff to break the detainment.