The Interstellar Club winning the preseason championship didn't cause much of a stir in the men's professional football circle. They weren't the first team to rise through sheer effort, and they certainly won't be the last.
Previously, these prestigious teams had ways to deal with such small teams, and now they've only perfected it further. Using star-level effort against this rather average effort is the simplest method!
Every prestigious team has very deep rosters with their own multi-tiered teams, ready to call up some effort from lower teams anytime, anywhere to handle the dirty work.
For these senior effort players, most are nearing retirement age. Football is a young man's game; each extra game means extra pay.
The victory of the Interstellar Club is no big issue; people are more focused on the state elections around the Federation.