He’s even worse off than Shinichi/Conan—Nakamichi and Shinichi’s other soccer pals aren’t dead.
I don’t see the point of this revelation of it isn’t to involve Taka’aki/Kōmei in the main plot—after all, you have that connection to Rei with the 0 on the envelope and Hiromitsu’s friend’s nickname AND we have the whole Rei/Shūichi/Kudōs meeting, with Hyōe aware of it. Too much is happening/adding up for this not to be an FBI/Japanese Security Bureaus/Team Conan effort against Rum and the BO due to the fallout of Shinichi’s public outing.