The Fijian, signed from Japanese club NEC Green Rockets on a hunch by Crusaders assistant coach Tabai Matson, is creating and finishing tries on the flanks not seen at the Crusaders since the days of Afato So'oalo, Marika Vunibaka or Norm Berryman.
"He brings that X factor and obviously he stands out," Dagg said. "He has a lot of physical presence and has brought a whole new dimension to our game."
Nadolo, a 26-year-old brought up in Australia who has played in Europe, Japan, and now New Zealand, has indicated he wants to stick around at the Crusaders, telling Radio Live Sport yesterday he didn't want to be a "one-hit wonder".
That's good news for Todd Blackadder and Co as they look to storm home in the final part of an extremely even competition.
"As a group we're tracking pretty well," Dagg said. "We're clear about what we want to do out there. It's the work that the forwards are doing and Colin [Slade] as well.
"It was building," he said of his side's form. "We were a bit unlucky not to get the win against the Hurricanes and maybe even the Chiefs [in round one] but we're not getting too far ahead of ourselves."
He said it was "awesome to have Richie back. He's a hell of a man and brings a real presence and experience to the team".
Dagg said he was pleased with his form after being dropped earlier in the season. His long-range kicking and darts to the blindside put the boot into the Brumbies in a different way.