User blog comment:LunarSkyes/An Analysis of Gao Mikado: The Mighty Sun Fighter/@comment-1755882-20141008130825/@comment-11454852-20141009034150

Well he was the main antagonist so they had to give him plenty of build-up, and they didn't even give that many hints towards him being Yusei, mostly just his mask having the criminal mark and his life prolonging machine sharing features with Yusei's D-Wheel. The only major hint of that was when he recued Antinomy while still looking like Yusei.

And had they not given him that much backstory and backup he could've ended being a boring main antagonist like (IMO) Don Thousand.