I thought there were 5 teams... and I thought a lot of other players were in it
Obviously the other team didn't put together a franchise in time.. The other players all made themselves available but it's a draft. Only those who get picked play. So the likes of Wawrinka, Gasquet etc. were not chosen by the team owners.
Most likely they were too expensive - i.e. they'd rather pick a Serena William and Kyrgios combination - spend a lot on really big name player and then little on unknown - than go for another top 10 player like Stan, Gasquet etc. Also clearly marketing, star power etc. all play into it since they want to sell TV deals...