Practicing against Bob Lilly, beginning in his rookie year, helped Niland become a Pro Bowler and solidified an offensive line that won two NFC Championship Games and one Super Bowl.
The Cowboys eventually won the NFC Championship Game during the 1970-71 NFL playoffs against the San Francisco 49ers, due in large part to Duane Thomas's 143 yards on the ground, but lost in Super Bowl V to the Baltimore Colts.
However, in the following year, they defeated again the San Francisco 49ers in the NFC Championship Game of the 1971-72 NFL playoffs and then the Miami Dolphins in Super Bowl VI.
In the latter game, Niland and Liscio overwhelmed Bob Heinz and Bill Stanfill, respectively, leading Duane Thomas and others to a whopping 252 yards on the ground.
Along with Rayfield Wright, Nate Newton, Larry Allen, Tyron Smith and Zack Martin, Niland is one of only six offensive lineman in team history with at least six Pro Bowl selections.