Pacheco ended up last season ranked as RB15 and missed 3 games. The other backs in KC combined for 50-360-2 with 45-413-5. CEH is currently not available. Perine could see what the other backs saw without really impacting Pacheco all that much. KC backs combined had 80 fewer touches in 2023 than the season before. If Pacheco is healthy, he should still see 18ish touches a game.
That's one of looking at it, but not may way.
My way is Pachecho averaged 12.66 PPR points a game in the games with Mckinnon, which was 26th.
He went nuts with 22.32 a game in the 4 games without Mckinnon.
I would suggest McKinnon had minimal impact on Pacheco's production or usage. It was a coincidence Pacheco scored 5 TD in the 4 games he played without McKinnon . . . that's why it appears he had a huge influx in fantasy scoring.
Put another way, here were the number of touches McKinnon had in the 10 games he played with Pacheco: 1, 4, 5, 3, 3, 3, 4, 3, 3, and 3. Pacheco averaged 15.3 touches with McKinnon playing but 20.5 when McKinnon didn't play . . . but IMO that had more to do with game script than anything else. McKinnon averaged 2.9 touches a game with Pacheco, yet Pacheco gained 5.2 touches without McKinnon. The most touches Pacheco got on the season was 25 . . . in a game where both McKinnon AND CEH didn't play. I think a lot of how things played out had to do with the regular ebb and flow of games. Pacheco averaged 18.9 touches in victories but 15.8 touches in losses.