Everything
Ryu continued to shoot up the stairs, his speed still getting faster and faster as his body reached saturation with Chaos Qi. He felt more powerful than he ever had before, he also felt that if he battled Starlight again now, even if he had to restrain his Chaos Qi, although it would still be a hard fought battle, he would still have more than 40% left in the tank.
Of course, this didn't allow Ryu to be complacent.
For one, after descending here, Starlight was suppressed. This wasn't a natural sort of suppression. It was just that when talent reached a certain standard, it could only flourish in the best of environments.