Nah, you still need to flank for ring of thorns combo and for 170 pot. It's like Monk now, you flank for full damage, but if something screws up and the mob turns or some such, you're not stuck using heavy thrust all over again for the buff. Staying behind the enemy for Chaos Thrust for the extra pot will be weird, but changing the requirement frees us up to use chaos on any target from any angle.