The lineup some people here are proposing to start the game is Thomas, Bradley, Crowder, Jerebko, Horford, which has not played a full minute so far in these 3 games. So no one really knows what that lineup would do.
There is no lineup that has played a lot of minutes except the starting lineup, and the only really comparable lineups are the big 4 plus Zeller with a 14.1 net rating (though I assume this is an aberration/terrible bench bigs on other teams) in 8 minutes, and the big 4 plus (sorry everyone) Mickey with a -64.6 net rating in only 4 minutes.
I still don't think it's soon enough to make a switch to the starting lineup, but I think we should look at how we start games and it should be an option down the road. I still think from a strategic POV, the starters need to be able to rebound well or we should opt for shooting and/or speed in the starting unit.