Martin Logan Logos vs Theatre vs Cinema

We are putting together a planar speaker home theatre system. Martin Logan electrostats will probably wind up for the front/surrounds (CLS, Aerius) or Magnepans. The Martin Logans are more likely as the CLS is might attractive as a full range electrostat.

In any event the center channel speaker is an issue. We lean to the Logos as it is a true electrostat and not a hybrid (ie, no woofers..correct me if mistaken) and the Theatre and Cinema are both hybrids (as is the Soundlab center channel).

Is there a reason Martin Logan discontinued the all electrostatic center channel in favour of hybrid design? Is there simply not enough panel area to generate decent SPL and freq range?

Amplification requirements are understood for all of these speakers. Such amps as a Bryston 7b monoblock are being considered or older Threshold S/500 type things.