I’d love to do—not a true commentary per se—but a close reading that puts 1 Corinthians into conversation with Ephesians.
1 Corinthians is the preeminent Pauline book on the practicalities of church life: what to do about conflicts and factions in parishes, especially those exacerbated by different personalities and different ways of being spiritual.
Ephesians is the preeminent Pauline book (and, yes, it is most certainly Pauline whether Paul penned it in its entirety or not) on the theology and mystical nature of the church: who it connects into the mystery of Christ, how individuals are joined in it, the ultimate nature and purpose of the church.
Hmmm. Now thinking that, I wonder how a joint reading of Colossians and Galatians would look…