Raccoon Jesus
We were right there
That reinforces my point that what you're claiming happened while Byfield was his winger, since they played together every night until Jan 18th. More importantly, because of that, the ice time that they spent apart during that stretch was situational and temporary. The fact that chances were up suggests they were separated when the team was being outplayed or protecting a lead, with Kopitar obviously getting the harder minutes. I think that you're making a mistake by assuming that the chances went up because Kopitar didn't have Byfield, when it likely had nothing to do with that.
The same thing is likely going here, but making it even worse is the fact that, when it wasn't Byfield on Kopitar's wing, it was mostly Lafferiere and Turcotte, two rookies who were not up to the challenge. Lafferiere, in particular, had some of the worst metrics on the team even before the promotion. While they were on his wing, Kopitar's goals against soared and his GF% plummeted, as you just showed. Those kids were much worse in that role than Byfield, who deserves a lot of credit for his importance to the line and complementing Kopitar so well, but I think that it's a mistake to jump all of the way to the conclusion that Byfield was, therefore, carrying Kopitar.
In general, I think that you're misinterpreting the stats to support this notion that Kopitar hit a wall and needed Byfield to carry him. It seems like a colossal stretch to believe that a future HOFer who is leading the team in scoring for the 18th season needed to be carried last year by a 21-year-old who was struggling the year before and back to struggling away from him. I'm not one of those saying that Kopitar carried Byfield, but it seems pretty clear by now who benefited a little more from the arrangement last year. Honestly, I wish that it were the other way around, too, since the team would be better off long-term being led by the 22-year-old, not the 37-year-old.
It has to be reinforced by the eye test.
No one really watching last year or this year will say Kopitar is 'carrying' anyone. He's not the player he was at all. He's much slower, not doing much in the corners, and definitely not covering 200 feet. There's a reason they have had Kempe stapled to him. And that line exploded with Byfield on it and Kopitar fell apart with him off it. Anything else is noise, particularly a 9 game sample.
If you want to split the difference and just say it was symbiotic I can live with that, but it's a long way from the initial argument, which was Byfield was/is carried by Kopitar.