You're missing the point though. The shadow is quite inferior to Meteor Chaser's until you have a sanctified and heroic token to blow on it. Chances are (and what makes most sense when you look at the stats from Meteor), he will get his holy/disc 4 piece set upgraded with heroic tokens before he'd use a heroic token to upgrade his chest. Until he can make that shadow chest 277, Meteor is his best option, especially when you consider cost.
Trust me, it will be months before he'll get the 264 and 277 tokens for his shadow chest.