By Chris Smith Talented midfielder Paxten Aaronson officially completed his move from the Philadelphia Union to Eintracht Frankfurt on Thursday. The transfer has been public knowledge for a couple of weeks now, with only a few final details left to wrap up before things were made official. Details of the transfer have not been disclosed by the Union, but it’s understood Frankfurt have paid $4m for Aaronson’s services, alongside significant add-ons, and a large sell-on percentage. “Paxten has accomplished so much in a short amount of time,” Union sporting director Ernst Tanner said in a club pr…