Take away two critical players from any team and see what happens.
If the Celts were totally healthy right now and ATL lost D Schroeder and Kyle Korver what do you suppose would happen?
The thing is, the C's have one of the deepest rosters in the league and it was mentioned here repeatedly by a number of posters that the C's depth would help them should an injury occur more than other teams could handle.
as for them losing Schroeder and Korver, they have Hinrich off the bench who's still capable as a back up PG, particularly against us and they'd have more shots going to Teague, Horford and Milsap who have been doing just fine against us.
Boston has a lot of 'decent to good' players, but that doesn't mean they are deep everywhere. In fact, they have been critically shallow in several key areas all year:
Point creation: They have one elite ball handler (IT) who can create points and one mediocre one (ET). Losing either kills either the starters or the bench.
'Big 3 / small 4' defensive wing: They have Jae.
Shooters: Outside of Isaiah, Avery, Kelly, Jae & Jonas, they have no 3PT shooters shooting above 30.2% (Rozier). So when you loose AB & Kelly and Jae is hobbled ... you are down to just Isaiah and Jonas.
Off-ball scorers: Isaiah is the only healthy player right now who has a point-per-play percentile ranking above 51st (Isaiah is 79th) on off-screen plays. This means that if IT is on the ball, he's got no one who can do jack off the ball around him.