Shuukichi Haneda - could he be the Masumi Sera's second bro

[Marsala]

In Vol 85 Ch 902, could Shuukichi Haneda have some relation with Subaru Okiya (hence Masumi Sera, hence the unknown child)?

 

Could he be the middle child of the family??

 

(Information about the middle child is that he is very intelligent. Shuukichi Haneda is sort of intelligent.)

[Chekhov MacGuffin]

Yes, he probably is the middle bro. We have a thread about the middle brother here by the way: http://www.detectiveconanworld.com/forum/topic/4679-masumis-second-oldest-middle-brother/

[Detective Max17]

I strongly believe that Shuukichi is the middle brother, he's got facial similarities to Akai and Sera and he's proven to be intelligent in the anime and manga.