Grey is aruse
I thought he said he was just pretending to be him to mess with him,
Grey is Aruse, but I'm guessing he's trying to cover up sth I just think he is Aruse coz of some observation like calling the inspector Reiichi-san like Aruse did and there are common personality between Aruse and Grey.
Aruse also told the inspector that he "hates to be indebted to anyone", just like Grey did as he walked out. (￣∇￣")
Grey may be Aruse because by the end of chapter 5, a random guy who apparently looks like Aruse from the past, wore a wig and bam it's Grey XD
So...grey is not aruse??
If he fucking was I'd be much more happier than how it actually ended..