I think it's about the way the defense perceives the threat too.
Back in 2018 when CJ came in the defenses had basically settled into this BS where they ignored the jet motion and stacked the LOS to disrupt run and pass. And the 6-1 worked because we didn't really have a run threat to bust through it and get into the second level. Gurley wasn't the same guy at that point and Hendy wasn't enough of a threat back then and he's still not, but CJ was. Defenses didn't want his big ass bouncing around in their secondary.
With the passing game if you watch offenses they all run similar shit because it's a copycat league. Some run it better than others, some are smarter than others irt the options on routes and whatnot but schematically it looks really similar in terms of the route combos. It's not like McVay invented routes in the WCO he's just really good at marrying them with the run game and teaching his players.
So when I see the stats Hendy always comes out looking good. But when I watch the games the offense is always stop/start when Hendy's the primary in the backfield. And I don't dislike him or anything I just detest watching this offense when we're trying to use him for what he's not because it's painful and stop/start. Efficiency for McVay's attack, like it or not, requires a good ground game. If he had a dominant OL or more pass game threats plus Stafford having a better grasp of shit/playing better maybe that wouldn't be the case but it is what it is.