Not really the blocking rather than the new spot of the kickoff. Teams before would just kick ball out and ball would be spotted at the 20. While now they have incentive to kick ball short to prevent ball from being placed at the 25. This new rule along with the rule that moved the kickoff up is a disaster for kick returners. The coverage team is down there in like 2 seconds. NFL really needs to move the kickoff back to where it was orginally.