He hasn't had this own thread before, but was mentioned in some past catchall threads. He has recently been spotted in the youth system of SV Sandhausen: http://www.svs1916.de/nachwuchs/nachwuchsleistungszentrum/leistungsbereich-u16-u19/u18/team.html However, it looks like he may have moved to the second team of Carl-Zeiss Jena: http://gillesngsportnews.blogspot.com/2015/07/arthur-ekalle-und-aaron-valentini-beim.html http://www.otz.de/web/zgt/sport/det...r-bei-internem-Testspiel-auf-Platz-1146566970 Transfermarkt has him as a '96: http://www.transfermarkt.com/aaron-valentini/profil/spieler/410124 Not listed on the second team page, however: http://www.fc-carlzeiss-jena.de/mannschaften/u21-2-mannschaft.html
Appears to be at lower-division FV Bruchmühlbach, where he has an American teammate. https://www.bigsoccer.com/threads/jacob-weiler-in-germany.2086336/#post-38363895 We haven't posted about Aaron in a while, but T'Markt has something that may be a full (or close to it) career history. https://www.transfermarkt.us/aaron-valentini/profil/spieler/410124 If you've been tracking U.S. players in lower German divisions for a long time, then the club name "SG Blaubach-Diedelkopf" may bring back some memories. Or maybe that's just me.