Everything I've read shows that the pecking order for reshape life is random, however in our latest attempt after 16 wipes - it picked neither of the two mages in the party. Yes - I know RNG, but on top of that - it only picked our warlock once - and that was after the other dps had been picked and converted.
It seems very likely there is a pattern - but everyone says it is random.
Again - I understand RNG (being 0 for 50 on Sha weapon drops), but the chances of this being a random event are about 1% or so (based upon the chances of us not being picked randomly 16 times in a row).
PS: I am referring of course to Phase 2 here.