I just did some re-organising myself, and this is what I found with Poser 6 sr3:
It will find the deltas and what-not PZ2s in the !DAZ folders, referred to by the INJ PZ2s, even with multiple runtimes, provided I add those runtimes to my poser library.  But, Poser takes like, 20 minutes to find and inject them !

Solution which cuts the time shorter and works for me, is to copy the !DAZ folder into my libraries folder immediately under my Poser.exe file.

So, even though the INJ poses are in other runtimes flung across my hard drives (external and internal),  my Poser6 will find and read those PZ2s in under 5 minutes.

Well, maybe it works only for my case.  But I thought I'd share my experience with others.

Eternal Hobbyist