@rough-minister-58256: i think i see something significant:

pantsbuild.pants.contrib.android-1.4.0.dev13.tar.gz

contains the relevant

__init__.py

files for

pants.contrib.android

to do the right thing. but the wheel that ends up on the path (i guess due to the pex resolver converting the tar.gz into a whl) does not contain

__init__.py

files