"Teaming" (social) organisms are also fun, sure. ;)

The Fermi paradox assumes we'd be good at observing aliens, and that aliens will leave evidence that's conspicuous to us. These two statements are roughly equivalent, basically saying there can't be too much "impedance mismatch" between the two.

But again, even besides that, the nebula can still "teem" even though we never see any here on Earth, because the Sun vs nebula math is just so different for interstellar travel too. Many civilizations, seeded from common dirty chemistry, then permanently separated by vast distance as the star migrates out of the nebula.

TL;DR nebula parameter differences solve Fermi even in a teeming universe, but I doubt we'd see the aliens even if they were here. ;)