Flare is the single wild card BLMs have. Mana Ward is the best Enkindle/Fester deterrent, Mana wall is a 2nd Surecast and premeditated stun evasion. Featherfoot, Keen Edge are useless without facing your enemy. Convelescence requires you to be healed. I don't see why THM is capable of outclassing BLM. And to really make use of Keen Edge you'd need to use shield combo, which no PvP options are available.