Not playing Cody/Brice has nothing to do with W/L.
Cody actively makes everyone worse on offense when he plays (or at least that was the case last season). Brice does the same thing, but on defense (and for his offensive talent he has not been able to really facilitate the offensive flow as the team performs far worse when he's on the court and has been prone to going back to bad habits of overdribbling and not moving the ball fast enough). Even Ace, with his ball-hogery tendencies, has shown a higher rate of growth in passing the ball quickly than Brice has.
When Harkless is out there busting his *** on defense, that's making everyone around him better, on both ends. Same thing with Svi. While I dont think Svi is very good, he has played a smart/controlled floor game this season and he's actually capable of putting up some defensive resistance.
I think Svi will eventually lose his starting job to someone, because at the end of the day he just isnt very good, but for now I'm fine with him playing the minutes he gets because he is out there helping others be better, or at least not actively getting in anyone's way of being able to get better.
And I know some people will say "Well start Brice and let him play with better players" but Brice is going to get absolutely cooked by NBA starting wings and is going to greatly compromise your defense.