something in between.. with TDB Bungie confirmed that they can have a dynamic Loot system.. e.g. certain drops will become more likely if you hadnt this drop so far.. like armor in CE.. OF COURSE the can reverse the effekt and augment tho droprate for gjallarhorn for people who actually have it.. why is this something Bungie would like to have? well, since player trading is not possible, you cant do shit with your 10th Gjallarhorn.. except sharding it. BUT there is a side effect if people see it dropping now and then.. they will continue to try to get it.. and this keeping on playing, since "it's so close"... so my guess is that Ghorn is dropped with 2% change by gjallarhorn owners and 0.1% by non gjallarhorn owners..