Re: Two centers making a connection or one- in a bujutsu body?
FWIW, I've only ever understood the four-legged animal to be a way of looking at how to move two connected people so that the other person is always kept balance deficient. You learn to connect (or not) to the other person, move them where there balance isn't and try to keep them there. To me, it's been something related too, but separate from what's going on in me.
As for going out and connecting to someones center and giving up your own, I'm pretty sure that obtuse way of going about things is only meant to be entry level. As soon as you're able to relaxedly connect to someone else, you have to start being just as aware of your own center as well. I've felt a few people at this point who were able to connect to me and put pressure on me without giving me any clear idea of where their center was and also put up resistance to me, making me feel like I was connected to them, but without giving up their balance to me. Essentially baiting me to give up more so they could take my balance.
I don't see how that's a bad thing. It becomes obvious pretty quickly, even against non-IS skilled people, that just making a connection isn't all there is to it.