Talk:Naganami/@comment-31935878-20171227201349/@comment-9985455-20171227211249

It's probably to control the availability of Type D guns, since the bonus FP from the Type D gun stacks. With double Type D, Naganami K2 (+6FP bonus per gun, plus its own 3FP) has 176 yasen power, beating out even Yuudachi at 172 with double 3FP guns. And the Type D can be improved, too.

If you put two of those guns on Shimakaze (+5FP bonus per gun), she gets 174 yasen power.

Even Yukikaze (+4FP per gun) pulls up to Asashio-class K2 tier, with 162 yasen power.

Plus there's evasion bonuses.