the topic of your thread kills the purpose of the thread. you even say yourself the e/d earth ele does no damage. yes its a solid tank but what's the good of a tank if everyone just runs past him.
i played a w/p in RA once when i was fooling around with my friend and seeing how long we can draw out a battle for. the w/p carried a build like
barbed spear
burning spear
remedy signet
watch yourself
healing signet
thats all i can remember. he himself says its a great tanking build and i admit the skills i carried cant get him below 25% health. but ask yourself. is he a great tank if all his enemies run past him without problems and slaughters his team. then hes only acting as a tree that's difficult to cut down with a butter knife but thats all he is, a tree.
obviously im straying from the point (xD) but if you bring it to perspective in AB or fort aspenwood. the main goal of those arenas isnt to totally obliterate the entire team like RA or TA. with that said, all you have to do is ignore the e/d and with his measly damage, he can offer little to help out his team as his only purpose in the team is entirely ignored by you.
edit
treat the e/d tanker like a 55 with SoJ. cept he doesnt have 55hp and is a teeny bit more difficult to bring down