I have raided all HFC with a shadowpriest but I wanted to reroll to a wl for legion. Since I'm interested in mythic raiding, I went over some stats and noticed all 3 specs are used through different fights. My question is if I will be fine for a "serious" mythic raiding guild using Aflli as mainspec and Destro for offspec? Or is it better to have Affli + demo? Also I read that affli gears for mastery + haste, are those stat priorities also decent for destro?