I compiled most of the Primal drops of Enlightened Dark into this sheet, they're all from warders though.
https://1drv.ms/x/s!Av68XbooqaptkheuhcdMuLV749_t
You should be able to get a good view on how common each individual primal weapon was in the pre-awakening Sleepers at least. More drops from more guilds would be ideal but I just don't have time anymore to do this stuff, too much going on at work...