Thoughts on why Chase in the backfield never works but Deebo in the backfield does?

[WeezyBengal]

They used Chase as a decoy on these looks more than once in the 49ers game and gave it to Mixon with a lot of success.

If they continue to run the ball well with Mixon, especially out of these looks, the plays to Chase will start to open up. Being able to run the ball well out of these looks and keep the defenses guessing on who is getting the ball (mixon or chase) is the key - its why the 49ers have more success with it than us.