I have an existing Engagement Nurture Stream running, with an individual EM already included in the stream (it's not a nested program). I just added a Champion/Challenger test for this Email. Will the nurture stream be smart enough to pull in the Test if it wasn't orginally part of the Email when pulled into the nurture?
Yes, just make sure approve the test. Once approved the test will be used in all casts of the stream until you declare a winner.