At the beginning of next season, it's likely both Maluach and Fleming will be deep rotation players. One can hope for more, but it's unlikely.
Now, by the middle of next season, they should have moved up the ladder to be regular rotation players or the Suns made a draft mistake. The Suns need at least one more 4/5 ready to play now.
After the trade deadline the Suns defense was regrettable. How much of that was on Ott, I don't know. However, the effort should have been there every night. I didn't see it every game though.