It's not clear whether an alternative with a default priority but not selected for an application is selected for the bean archive whose beans.xml declares it.
The spec states:
An alternative may be given a default priority, but not selected for an application using the <alternatives> element of the beans.xml file of the bean archive. The <alternatives> element contains a list of bean classes and stereotypes, along with a disabled flag and a priority attribute. An alternative is selected for the bean archive if either:
Pay attention to the last sentence of the paragraph.