| Wide receiver | 29 |
|---|---|
| Cornerback | 26 |
| Running back | 19 |
| Tight end | 19 |
| Safety | 18 |
| Guard | 15 |
| Linebacker | 13 |
| Offensive tackle | 8 |
| Defensive end | 7 |
| Quarterback | 7 |
| Defensive tackle | 6 |
| Long snapper | 1 |
| Center | 1 |
| Fullback | 1 |
Sources:
pbs.org

| Wide receiver | 29 |
|---|---|
| Cornerback | 26 |
| Running back | 19 |
| Tight end | 19 |
| Safety | 18 |
| Guard | 15 |
| Linebacker | 13 |
| Offensive tackle | 8 |
| Defensive end | 7 |
| Quarterback | 7 |
| Defensive tackle | 6 |
| Long snapper | 1 |
| Center | 1 |
| Fullback | 1 |
In the 2012-13 NFL season, there were 170 concussions in total. Wide receivers sustained the most concussions out of any position, totaling a dizzying 29 concussions during the season.
Your graph follows logic. "In-space" collisions are frequently the most violent due to the velocity of those involved. I would have thought safeties suffered more than corners, who are often running alongside receivers and heavily involved in run stopping.
As for the corners, I meant "not" heavily involved...