Board Thread:Game Updates/@comment-26091666-20160624120924/@comment-24930367-20160625073137

They could choose other letters and not skipping C for D. Like, why would the cranes get an A rather than...like, F, or why Kasumi got a B...

Then they just randomly jumped to D for Asashio.

If anything, Vcharng's guess is a nice one.

Maybe the D variant would sacrifice her surface combat strength for other things (AA-ASW-LoS), just like Matsu-class. Of course she might be able to equip 'other things'.