And Dinah went through some training under Lady Shiva, his rival. It kind of would've been neater if one of them were trained by Bronze Tiger instead of Richard, though, so they would've each been trained by the DCU's top martial artists.
Richard was in the wheelchair for two reasons, a) to break Vic's expectations so he keep his guard down and be receptive to Richard's teaching, and b) to give him a different perspective, and learn how to deal and fight from that position. So training Vic inadvertently prepared him for training Babs!
The interesting contrast between his training Babs and all of the other folks I know of he's trained is the focus seems to be on the martial aspects rather than the philosophical, though I guess I can't say for sure not having seen more of this myself. Helena and Renee's training had a lot more to do with the philosophical and spiritual, but that's probably because they were put on to Richard by Vic, who, while certainly learning a lot from the martial training, got a lot more out of the rest. His motive behind introducing them to Richard was mainly because of their reminding him of his own pre-training days, after all.