Perhaps, but... I just can't imagine Tsutomu, after all this time, having an incorrect interpretation or impression of that crime scene—or even missing info. Him being Hyōe would seem to imply just that—and then there'd be the matter of why and how he took Hyōe's place, in terms of his long investigation of that crime. Certainly, taking the place of the man who seems to be the boss of the secret police agency Zero would put a lot of power and influence in his hands... but how would it help him with the Kōji Haneda/Amanda Hughes case? Is it just to use Zero/the Japanese Public Security Bureaus to finally arrest the culprit?
If you asked me to chose between which male Rum suspect I think is actually Tsutomu in disguise... then, right now... I'd have to pick Kanenori. The possibility of him being Hyōe is not one for me to dismiss completely, yet... but it seems to me he'd still be in the thick of the action, rather than acting from a command-and-control position—Hyōe has only been "on the ground," so to speak, once (Burning Tent case), while Kanenori has consistently been "on the ground" (His intro case, Boss reveal case, Snowy mountain case with Rei, Kogorō and Conan). Hyōe directly approached Rumi, while Kanenori as only watched her from afar—while I do think that now Rumi has the highest chances of being Rum (that she's ever had, in my book), I still think her feelings towards Kōji are not ones his killer would have... and I still don't think Rum would actually carry the Shogi Bishop Piece that Kōji used for his dying message around for 17 years. I still think Rum would've simply destroyed such evidence.
But then there's Gosho's SDB Black+ comment that implies there are only three Rum suspects. The only way Hyōe can be Rum is if he's letting Bourbon, Kir, Shūichi, Ai and Conan all live... only so he can get them all in one fell swoop, using their own plan (the one Rei, Shūichi and the Kudos discussed "offscreen" between 1,012 and 1,013) against them. Otherwise, Rum is either right on top of Shinichi/Conan and Shiho/Ai (Rumi), or is right on top of Kogorō and Rei/Tōru/Bourbon (Kanenori).
In other words... my wait for decisive info in this arc continues.