We have come across a number of occasions where we needed to go back and create a new fall section of a course to accommodate some strange situation that came up, and Enroll Group doesn't show the fall one the term has passed.  There really isn't a great reason (that I can think of) not to just show all terms for the current year, so I would suggest that Enroll Group do that, rather than limit us to what it believes will usually be the case.