Jakeel

Well I think many times, the way character feel about others not necessary right (Conan did feel uneasy when he first met James Black, yet he turned out to be an FBI Agent, and quite a good boss to his subodinates). Beside, from other characters' view ( Akemi, or Jodie ) Akai was a good and gentle man. Don't forget GA sensei like to confuse reader by drawing good/ innocent/ not involved characters with seemingly creepy faces at some points of the cases. Anyway, personally, I think Akai's the cold outside, warm inside type, tho he grew colder and somehow obsessive to taken down Black Org after the death of Akemi. As of approaching Mouri family, I think to keep an eye on the newly appeared character, to find which one is working for black org, and so. Anyway, unless GA sensei planned to make Amuro a brand new character, OR Amuro is Bourbon and Bourbon had had time in the police force (for god know reasons), I think Akai is the most fit for this. Who knows. GA sensei always knows how to surprise readers. All just ideas and guesses anyway.

I think Amuro is Akai. In the previous chapter "The Strongest Senpai", there's scene when Takagi remebered Date talked about a "Number 1 guy in police academy." Date said: - Gentleman like takagi - Disappeared and Date had no idea where he is. So it's possible that Akai (Amuro) was in police academy with Date, after graduated, he was recruited by FBI and then went undercover. That's about the time that Date lost contact with him (When Amuro del the msg, it doesnt show the date of the msg so it's possible that the msg was sent before Akai went undercover. Also from previous cases, it seems like Amuro already knew Kogoro Mouri is fake and the real one that solving cases is Conan ---> Akai had worked with Conan before, obviously he knows this. So yea, I think Amuro is Akai