umm so what should he be doing in the meantime then?
ganon doesnt exactly have any fast Oos options
That's not the point.
*Anything* is better than doing one thing always. If his opponent watches, he'll get predicted, and he will lose games. He has to get over it. Really; at this point it's not just a matter of him deciding something else to do. If I'm right, then even if you told him about the regularity, he will be unable to kick it for a bit, because it is a habit. And further, he will need specific effort, beyond repetition, to kick it, because it holds moreover that it is a
fear (if I'm right).
But to think of some other things... there's... rolling the other way, or shield jumping -> bair, or to dair, or he could drop shield and dash, possibly mixup to a pivot Murder Choke, or he could... do nothing. I make no guarantees about the viability of any of these options.
When he's got some repertoire of options in hand, he can then reintegrate back rolling.