A Thief tank would be interesting... Obviously Steal would apply to enmity, which would be different enough from Provoke, somewhat fits with XIs Thief as well. That would make it an evasion based tank that steals enmity, rather than building it themselves. I like that concept lol, you'd have your regular DPS skills from Rogue, and then Thief skills for gaining and maintaining hate. Actually reminds me of Zidane, he certainly wasn't a stealthy Thief, more of a mischievous, center of attention, type Thief.