With mana cede and the af3 +2 merits on making reaching the tp bonus damage cap on merit bps faster You dont necessarily need 2 fully merited unless you're constantly in a situation where you're bping magic damage and releasing so you should have points in other areas.
I agree with this. Personally I have 1 in each and the rest split evenly in Heavenly Strike and Wind Blade. Way I figure it that gives me ability to burst on light and dark and I use the ladies mostly anyway when solo/lowman.