i have beat hard crota 6-7 times after i got Glowhoo (all chances to get crux) and i have been swordbearer all the times and still havent got the Crux Of Crota... i have seen 4 others get it in my lobby but its always there 2nd-3rd time (so they only have 2 chances to get it) i think that being a relic-holder on any raid to beat the boss should get a better chance at getting the raid exotic materiel or weapon, because it takes time, effort and skill to get good with the relics in the raid...