Does the below sound ok? 1. Interference is caused between coherent waves 2. When we try to find which-way we break the coherence a) When we try to "partially" find which way, we partially break the coherence and hence a "partial" interference pattern 3. DCQE is explained by the fact that the sub-sample is taken either of coherent or in-coherent bunch of photons (via pairing in the co-incidence counter) depending upon what we did to p-photon ...and thus matches with (what we did to) p-photon.....for the sub-sample of s-photon as well.