The RDN Iver Huitfeldt Class regularly operate as escorts in USN CSGs and they don't appear to have a problem. The CODAD isn't a "step backwards" at all, just a different propulsion system. FYI our Leander Class frigates had steam propulsion and they could quite easily keep up with USN CVNs when they were part of USN CBGs. In fact they only they were the fastest non nuclear powered ships of the CBGs.
IF we acquire the AH140, maybe we should look at going full DE with electrical propulsion and the MTU diesels being used for pure electricity generation. That would simplify the drive trains by eliminating the requirement for gear boxes and drastically shorten the drive shafts which in turn significantly reduces the loss of energy to the props. Also, it reduces the noise potential because a source of noise is eliminated.
Pretty sure CAMM is quad packed for the MK-41 VLS. It has been advertised as such for the last few years.