Akai family's middle brother

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Masumi Sera reveals that she has a second brother whom she has been calling regarding case solutions.

Description and known facts

The middle brother's hand and cellphone

• He does not look like Shuichi Akai or Masumi Sera. Those two take their looks from their mother, while the middle brother looks more like their father.
• The middle brother is older than Masumi, but younger than Shuichi. Neither of their ages have been revealed, but Masumi attends class with Ran and Shinichi who are 16-17, and Subaru Okiya claims to be 27.
• He is apparently in the middle of an important job and won't tell Masumi where he is.
• He is very intelligent; note that Sera characterizes the already intelligent Akai as "strong" in contrast to the middle brother. He advises Masumi on cases via cellphone. He was able to correctly deduce over the phone that masumi's deduction was unreliable in a bathroom murder case.
• In one panel, we see the middle brother responding to Masumi's message using his right hand and a black cellphone. Unless the brother is disguised, this would imply he has light skin. The use of the phone with the right hand is not an absolute indicator of handedness because sometimes characters with known handedness will use phones with their off hands.
• The middle brother recognizes Conan and knows he is a good detective.

Possible Suspects

Assuming the middle brother is between 16 (lower range for Masumi's real age) and 40 (upper range for Akai's age based on his appearance) the following characters could qualify as suspects in reverse order of their introduction date.