The report says Philadelphia Union have gone 12 matches unbeaten, with the club moving away from the lower reaches of the table. Cavan, 16, has emerged as the central figure in that run.
He is credited with:
Quinn’s return has supplied experience and balance, while Cavan’s attacking output has given the Union a sharper edge. The challenge now is extending that impact beyond a short burst of form.
The Sullivan brothers are not yet in the same historical bracket as MLS’s established sibling partnerships. The comparison cited in the report places Diego and Yimmi Chara at the top, with Cristian and Alex Roldan close behind.
The Roldans represent the clearest example of sustained partnership. Cristian has built a long career with Seattle Sounders, while Alex has also remained a consistent presence at the club. Their combined longevity and silverware set a demanding standard for the Sullivans.
Other notable pairings include Giovani and Jonathan dos Santos, who shared the LA Galaxy squad, and Chris and Stephen Wondolowski, whose combined scoring record was driven by Chris’s prolific MLS career.
Cavan’s future adds urgency to the story. The report says he is expected to spend one more full season alongside Quinn before turning 18, after which a move to Manchester City is anticipated. That transfer remains unconfirmed, but the possibility makes the Union’s next campaign especially important.
The next test is whether the Sullivans can sustain this production across a full season. If they do, Philadelphia’s revival could become the start of an MLS partnership remembered long after Cavan leaves for Europe.