Genma, Brother of Goku

There have been plenty of What if scenarios;
What if Goku went Super Saiyan at the World Tournament as a kid
What if he remembered his Saiyan conditioning as a baby
But this one is going to hopefully be a decent spin on it, someone who is the Joseph Joestar to Goku's Jonathan, Someone who lacks Goku's raw power but has a greater control of his power

Because if Son Genma can't be stronger then Goku, then he can definitely be more smarter