This is what Setherick wrote a while back:
Kick Returner
Attributes: Kick Catch (100); Speed (33); Break Tackle, Carry, Avoid Fumble (16)
Analysis: In v.3.x this position was largely ignored. It was throw the fastest player you had back there and watch him pick up lots of TDs. In v.4, there are still lots of PR TDs and KR TDs to be had, but now, kick catching is absolutely essential. If the player bobbles the kick, he is very slow to take off and will end up fair catching a punt, downing a kick off, or not gaining as many yards as he should.