Karrot i see nothing wrong with Lava Plume, i think we should replace Will-o-Wisp with it. I do think Earthquake would just throw out all the offensive stat-ups out the window.
Just my thoughts, i think the BST was chosen from big names, Aldaron and Mekkah. I seriously think the BST was chosen for infamous reasons, but that is just my thoughts. Sure it has defensive stats, but it has offensive typing. You guys are MAKING it all defense by giving it all defensive moves. You would think a defensive Pokemon with offensive stats, would have a balanced movepool, offensive and defensive wise. But mostly everyone is just hammering down on chosing defensive moves. Hell, Swampert has offensive typing as well, but it's movepool diversity lets you use it as a Choice Band ( Earthquake, Waterfall, Ice Punch, Stone Edge/ Hammer Arm ), tanking set ( with Curse ) or a pure defensive set with Stealth Rock, Roar, Earthquake, Avalanche/Ice Beam. Sure its stats yell defense, but since Gamefreak gave it some offensive options, you can use it how you please.