I don’t understand the strong attatchment to the specific doctrine of imputation. It’s at best a theologoumenon, a theologian’s word for a concept that the Bible gives to us metaphorically. I also want to ask what the doctrine of imputation gives us that can’t be subsumed into the doctrine of union. The Eastern concept of theosis, or as Paul says “putting on Christ”, seems to convey the same substance but with richer, less artificial metaphor. I don’t think that imputation is wrong, but it’s not the whole story.