2016 NBA free agency: Who is the mystery team that met with Al Horford?

Day 1 of NBA free agency is in the books and the Pistons didn't make a splash -- just an Ish -- but Al Horford is still out there and some Pistons fans are dreaming (literally -- it's past midnight).

According to ESPN's Ramona Shelburne, Horford met with four teams on the first day of free agency. One team was curiously listed as "a mystery team".

Al Horford had a long day of meetings in Atlanta today with Celtics, Wiz, Rockets and a mystery team. https://t.co/Vi0ndN7fyk

— Ramona Shelburne (@ramonashelburne) July 2, 2016

It's probably not the Hawks, because that should be no secret. In fact, they're reportedly trying to clear cap space to re-sign him. And, c'mon, why would the Hawks be the mystery team in their own city for their own cap hold? It just doesn't make any sense.

So, assuming it's not the Hawks, then who is this mystery team?

Well, the always-secretive Stan Van Gundy was Instagrammed at the Atlanta airport ... back in May 2014. Horford's from Michigan and the Pistons are young and enticing. Remember that mystery team going after Prince Fielder in 2012? Who? Stay with me... It was Detroit bringing a player home to Michigan, and Stan Van Gundy's a baseball fan. Van Gundy and Jeff Bower were not around in Orlando today either. It all makes too much sense. Obviously it's the Pistons.

Okay, I kid, but seriously, it could be. The Pistons would have to do some aggressive wheeling and dealing, but it could be. Probably not, but it could be. The Pistons were originally among the many teams to reportedly express interest in Horford. A few days ago that list included the Pistons, Thunder, Celtics, Wizards, Rockets, Lakers, Magic, Nets and Heat.

Horford's expected to make a decision this weekend, according to Adrian Wojnarowski, who will probably break the news.

Now your speculation on mystery.