If the Seraphim were introduced much earlier I would think they were Mark 2 and now 3 could be anything but I'm assuming all the Mark numbered series are Kuma based.
There beyond a pacifista over the seraphim would be crazy. The seraphim are still pacifista despite being newer versions
I feel like itd be weird to introduce the 3rd variant if it isn't over the orginal pacifista and seraphim. Going from mark 1 (original), 4 (seraphim), 3, and then i assume 2 would be eh
Well if the og kuma is mark 1 and the marineford like ones mark 2 then i guess itd make more sense