Williams was added as a gunner opposite Bethel, giving the Cardinals unmatchable speed when defending punts. Bethel, who regularly beats his blocker by four or five yards when he's not double teamed or pushed out-of-bounds, has reportedly run a 4.5-second 40-yard dash.
Williams said he ran a 4.26.
Arians loves fast guys. When Williams, whom Arians coached in Indianapolis last season, was healthy, the Cardinals wasted no time signing him.
"I don't think there's any time where you can turn down that kind of speed, especially when it can help you on special teams,' Arians said. "He was fun to coach with and fool around with.
"He can be dynamic across from Justin and stop some of the things that are happening to Justin as far as double-teams and triple-teams. They could be the fastest pair of gunners in the league."
If Williams is as fast as advertised, Bethel expects him to force teams into a tough conundrum. Do they double-team Bethel and leave Williams single covered? Do they double Williams and not Bethel? Or do they double-team both?
If a team opts for the last of those options, that means there's only six players left to block eight. The odds are in the Cardinals favor.
"I think it's going to be a good attribute to have him out there with his speed," Bethel said. "I'm looking forward to seeing it."
Together, they can flip field position by pinning the other teams deep, Williams said.
Of Dave Zastudil's 37 punts this season, 14 have been returned, 12 have been fair caught, eight have been downed and three have been touchbacks.
With he and Williams back there, Bethel foresees even fewer punts being returned.
"If it works out like it should, there should be either all fair caught balls or tackling at the point of the catch," Bethel said. "We'll see what happens. We got a lot more season left. We got a lot more games to play."