You can want it. You can hope for it. But please, I’m begging you — don’t expect it.

The moment the 49ers traded for running back Brian Robinson, the drumbeat started. From fans, from the media, from anyone with a fantasy football team, the call came for Niners head coach Kyle Shanahan to play Robinson and Christian McCaffrey on the field at the same time.

If I’ve heard it once, I’ve heard it a thousand times now. And it’s starting to give me a headache.

The logic, as it goes, is that this two-headed monster would solve the 49ers’ wide receiver depth issues — just flex McCaffrey out to the slot. The argument is that it puts the team’s “best 11” on the field.

But this isn’t Madden, folks.

Pushing for a Robinson-McCaffrey backfield shows a fundamental misunderstanding of how Shanahan’s

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