For me openers involve any abilities that force a reaction that isn't blocking. For me this involves unblockables and bashes. Unblockables force them to dodge or attempt a parry and if you can predict what they will do then you can counter. Bashes force the enemy to dodge and generally speaking they guarantee some damage even if it is only a little damage. I would say that bashes are the easier openers as you don't need to predict what the enemy will attempt to do (unlike unblockables), you can just do it. To continue the idea of bashes I think bashes should guarantee you some damage, as missing one can lead to getting hit by a guardbreak, bash, dodge attack. Unless if they are meant to be a disengage (as I think Tiandi's Dragon Kick will probably be used). It also feels like Unblockables are the weaker opener, as most people will sit there, confident in the knowledge that you will probably feint the attack and if you don't they can probably parry it on reaction.