User blog comment:Nanamin/Fleet Formation Affects Evasion - Taken from a Japanese Blog Post/@comment-17748879-20150628211954

Hmmm. The last line, the rumor that AP shells increase critical hit rates and the accuracy and evasion of married ships.

If that hypothesis is correct, then there would be some hidden things that we really don't know about this game.

Beside, I suspect that the fleet LOS also affect the evasion. But that's my hypothesis only.