For the few divergent pieces I once tested the rule of thumb that their total value is the weighted average of the non-capturing and capturing components, where the later count twice as much as the former. So mQcN was around 5 (N=3, Q=9 scale), mNcQ around 7. The Tower and Cardinal can also be written as mQcR and mQcB, so I would expect values 6.3 and 5 for those.
For the few divergent pieces I once tested the rule of thumb that their total value is the weighted average of the non-capturing and capturing components, where the later count twice as much as the former. So mQcN was around 5 (N=3, Q=9 scale), mNcQ around 7. The Tower and Cardinal can also be written as mQcR and mQcB, so I would expect values 6.3 and 5 for those.