I think it's sure that Bearshare prefers own client connections:

I've made a test: installed BearShare and connected to the public.bearshare.net host. 2-3 minutes later i had 10 bearshare connections.

Then, i removed all bearshare hostcache entries and connected to connect1.gnutellanet.com... and... got nearly 100% gnucleus connections

one thing is clear: BS can connect to others, but it doesn't get the IPs of "concurrent" clients by default.

That's the politics of Vinnie