I managed to 3 star the first 2 maps of the second stage before it disappeared
My teams were at : 43k and the rest at 20-25k
Had to redo the first map twice because of RNG *sigh*
Otherwise if you choose a good support (35k+) you should not have any problems (at least on the first 2 maps but I guess the other 2 should not be that much harder as the game just started basically)

That said it would be nice to find a few people who actually put their best team as their helper team

If you want you can add me ( ID: 302199111 ) my helper squad is at ~46k currently