Not sure, I like the 4/team, but I see how that can cause problems. There is no rush to open the thread now, DC is still in 2 months.
I mean, in Doha week I post it, ok?
I think the max of 4 per team is pretty good, a lot of players in a team could disconfigure the whole concept in a Davis Cup team.
We can set up like reserve players (in case somebody in the team does not post). Reserve players would exist only in team with high popularity (like Argentina, USA, etc).
We would still do that division I said because there will be no way we will get 16 teams with 4 players so, only teams with 2 players to 4 players would be allowed.