I just don't think Dzeko is all that. Maybe on Remy's level. Or just above. JT doesn't make silly mistakes Kompany does and is also an amazing leader and lays his body on the line on every play. JT is the best CB in England.
Zouma is raw too though. Kalas played well last season at Anfield, and that performance is better than anything we've seen from Zouma. I do think Christensen has the highest ceiling though.