The relatively little of Piqua that I've been taught as of yet seems to flow very naturally from the Baji I'm doing.
I think one important thing to keep in mind in view of application is that the two styles engage at slightly different ranges, so the change from one to another accompanies the shifting of fighting range.
"Once you get deeper into the study of Kung Fu you will realise that lineage and insulting others become more important than actual skill and fighting ability." -- Tai'ji Monkey
"Eh, IMO if you're bittching about what other people are doing instead of having intelligent (or stupid) conversation about kung fu or what your favorite beer is, you're spending too much time exploring your feminine side." -- Meat Shake