I feel like this power boost uryuu is recieving is just so he will be strong enough to wield yamamoto's bankai in the event Juhabach dies in battle and/or from whatever illness he seems to have. Also, did anyone else question how yuzu and karin survived the holy selection? They're all mixed bloods too. In fact they should have all the latent powers and abilities ichigo has but none of the other characters, save for maybe urahara, seems to acknowledge their potential.
Anyway, it looks like chad and orihime got some more training in while traveling through heuco mundo, but just like the other arcs its probably not going be of much use. In both the arrancar and fullbring arcs they implied that they went through training and were much stronger than before. They even gave speeches about how they were never going to get in the way again/ become strong enough to fight by ichigo's side. But despite all their hard work and new found resolve they never seem to make any progress and they always need saving....