Agreed with whoever said that the concern is offense, especially come playoff time. I'm a firm believer in the saying that defense wins championships. I don't think you can win one without a great to elite defense, but at the same time, unless that defense is of all-time great caliber (or at least close to it), you still need some balance offensively. Defensively, I think we are going to be (if we aren't already, although last year was too small of a sample size to say for certain) championship caliber. With Exum, Favors, & Gobert in the starting 5, our defense is going to be good regardless of who else is playing alongside them. With Hood & Hayward (both of whom are above average to good defensive players) next to them, our defense has the potential to be the best in the league. Even without any improvements (& injuries obviously), I think a team with that starting 5 (plus Burks as the 6th man) has the opportunity to consistently be a top 4 seed in the WC because of it's defense (& good enough offense).
Imo, if we don't win a championship within the next 5 years, it will be because of our offense. Right now, we have Hayward (who is a proven #2 option), Hood (who showed the potential of a #2 option), & Burks (who appears to be best suited as a 6th man who can act as the 2nd units #1 option) as our main offensive threats. Favors has also shown that, given a solid PG, he can provide enough offense to be a #3/4 option on a championship caliber team. Gobert will likely always be limited offensively so, unless we somehow acquire/develop a true #1, how good our offense (& in affect our team) is will come down to what type of offensive player Exum develops into. He may have the quickness & athleticism to become a #1 scoring option, but unless he gains enough strength to become an elite finisher or turns into a knockdown outside shooter (neither of which are likely, imo), his offensive ceiling is probably that of a #2/3 option.
Our defense may just be good enough to overcome not having a true #1, but it is tough to win 4 out of 7 games, 4 times without a player who can score on his own & singlehandedly take over offensively when the game is close. We might be able to get by with an "offense by committee" if Hayward, Hood, Exum, & Burks are all #2/3 type scorers, but our defense will likely have to be elite in order to do so. Luckily though, it has the potential to be just that.