IT was a bad defender because it was like he wasn't there. Kyrie will be better because opponents won't be able to just shoot over him.
This - and if Cleveland can't bring in another star using that Brooklyn pick, they are going to find out very quickly how much of an effort it is when you are stuck playing 4-on-5 on defence.
And while Thomas is out and Rose is starting in his place, they are going to need to find a way to deal with the total lack of court spacing - since a 5-man lineup that features Derrick Rose, Lebron James and Tristan Thompson would have to rate among the worst outside shooting lineups in the entire NBA, and opposing defences will be able to freely pick and choose who they want to sag off in order to clog up driving and passing lanes. Given how much both Lebron
and Rose depend on penetration for their offense, that could be interesting...
Having Crowder (and his ~40% 3PT shooting) out there is going to be absolutely crucial for Clevleand now that Kyrie is gone.