Giles needs to play better defense. Just to be clear KK is the better player right now. But Giles can do things KK can’t even dream about. That fact is the nub of the problem.
The Giles-Koufos thing is tough to figure out for who gets those 12-15minutes behind WCS. If we were 6-17 and Koufos was still getting the minutes, then yeah I'd have a huge issue with how Joerger is handling the run Giles is getting. But we are winning and Koufos is providing 2 things we desperately lack right now (rim protection and rebounding) that we don't get from elsewhere on the roster. Basically every metric shows he's providing a huge impact on the glass and defensively and is due for some positive regression with his offensive game.
Giles is infinitely more talented offensively, but we aren't losing games on the offensive end. I don't like him not getting burn, but I don't think it's wrong to give his minutes to Koufos when he's a valuable contributor and we're still in the playoff hunt. Tough spot to be in for Joerger.