There are benefits to train together with your peers! You learn about the musicality - more so with a good choreographer! How to relax in the moves so the the performance looks like improvised and still stay synchronized with your peers!
There were several groups in the competition but tis one I like a lot!
Tango Formation 2nd Round 2 2015 Korea Tango Championship
Chachirulo tango formation
Korean
https://www.youtube.com/watch?v=wEBGMle69oE
Argentine
https://www.youtube.com/watch?v=OPY8O-c8LPI