Once Rui dove into training, nothing could pull him out. Having finally completed his commitments to the task-force, he was completely unshackled and free to pursue his own training as much as he wanted.
And that was exactly what he did.
The only thing on his mind was Project Forge.
He continued grinding away as hard as he could to complete his foundational mastery in a variety of different fields and principles. This was certainly the most time-consuming part of his training, so a majority of his time went into developing proficiency and muscle memory.