Just last night my friend Arch needed Paladin Body. So I shouted once for Blanga; not only did I get three people who needed seals. But two friends of mine joined for the sake of just helping me out. Eventually when we got to Blanga; there was another party there, but they only needed the one seal we didn't. So we had 12 people collecting pops/procing Blanga/bringing him down.

I really don't see what people mean by seal party are dead.