Westfall's choir robe analogy: all differences subsumed under identity in Christ

Westfall compares being clothed in Christ to wearing a choir robe: all differences are subsumed under the identity of being in Christ, just as choir robes hide individual differences so that 'the primary identity of a choir member is that each one is part of the choir, and the function of every member of the choir is singing.' Mike sees this as a radical expansion beyond Paul's teaching — Paul's metaphor is about sonship and belonging/inheritance, while Westfall's analogy is about function and role in interacting within the body.