Talk:Kishou Arima/@comment-101.99.4.250-20150506134653/@comment-10733658-20150506140137

They explicitly explain the reasoning for his placement in the Raid.

They knew there were two Owls, but didn't know where Eto would appear from. They assumed V14 was the only way in, so Arima was lying in wait for her there. It's just that she was apparently already in the 20th Ward just waiting to make her move.