What is the safest position in football for avoiding head injury?

If we allow some large assumptions, and I haven’t blundered on the data in my hastily assembled sketch, it looks like the answer is Center.

Assumptions:
These numbers assume a generic roster structure. In reality, left and right guard are different, as are strong and weak safety, some defensive tackles are nose tackles, sometimes the tight end sits while a third wide receiver comes in, etc.

We’re also looking at concussions per position, not per player. In other words, it doesn’t matter how many guys actually played at the assumed three linebacker positions, these numbers just look at the position.

And, the most dubious assumption here is that the reporting is accurate. Nobody knows what percentage of concussions are ever reported, but the number is probably very low.

The white numbers are total concussions at each position. Red numbers indicate total concussions at that position, divided by instances of that position on the field.