My take is I'm not as concerned about the perimeter defense. If a team gets hot from three, we also have the ability to make it rain from three. Last year, TKR was simply not a rim protector. When he tried, he was in foul trouble early. We gave up so many sort looks at the basket last year, especially late in the clock. I think this made the defense look terrible. And when they'd miss the short shots, we couldn't rebound. Gave up too many easy buckets and gave teams too many bites at the apple.
With DJ and Cluff, I feel like we have some rim protection and can end possessions with the rebound. The perimeter defense may be a little suspect with Braden, Fletcher and Oscar as the 1-2-3, but the other team then has to beat you with threes. And we're fully capable of matching fire power there.
Mayer being able to make his own shot changes up our offense significantly as well, he haven't had a guard like that since Carsen. The offense being very hard to defend, coupled with some increased level of rim protection and this team is suddenly MUCH better.