Luck
Ryu returned to the Seventh Heaven, a feat that wasn't actually all that difficult for him now. All he really had to do was take some time to draw out a large-scale formation.
He didn't have the resources necessary to do it, but the blackhole within him was all he needed, really.
It was still an impossible task to control those treasures within him. In fact, now that they had all banded together, they were even more unruly and difficult. Before, he could just barely manage to use the Infinity Mist at a great cost to himself. But now, just budging things made him feel like his body might explode.
It took him entering Breath of Heaven and focusing for about half a day before he could manage to take out a sliver of the force hidden within his blackhole Natural Treasure.
Luckily, that sliver was more than enough to power his formation and send him right back into the Seventh Heaven.