KP NetRtg is just the moving average difference between AdjOffensive and AdjDefense. Of course, with all the special sauce adjustments for pace, strength of opponent, etc.
In the sense that the best teams can constantly improve their AdjOffense/AdjDef throughout the year , yea they could make it better.
But you’d think with having to play some quality KP ranked teams, they are going to have close games, which will have some offsetting effects on their currently bloated NetRtg.
It’s why Duke’s NetRtg was so high last year. The ACC sucked and they boatraced a ton of crap teams the whole year.