I guess people should wait for the final result of the investigation.
Since if it happens that Kawhi will find guilty on those mistake they have made then provably that he would face a heavy penalties from NBA.
But there's good chance that they will get compromised on this deal since it seems that they have basis that those under the table deal is true. To bad for Kawhi if he's career will fell short because of this controversy.

I am not sure if this is true or not, I am not the investigator, and I can't really make a judgement out of the case. However, it feels like the most common way of paying someone under the table, like the first thing that would come to mind, and I sure do hope that they are not both that stupid to do something like this.
Steve Ballmer is a rich dude, he didn't became rich by being a stupid idiot, and this would be such a simple way of getting caught. I am not saying they didn't do it by the way, maybe they did, I wouldn't know. I am just saying if they did, then that is the most stupidest rule breaking I have ever heard, I mean illegally carrying millions in duffel bags filled with cash to his doorstep would have made more sense than this lol.