Arenado began hitting second toward the end of the Rockies' homestand, after regular No. 2 hitter Michael Cuddyer went to the 15-day disabled list with a left hamstring injury. But Arenado was hitting well before then. He carried a 16-game hit streak into Sunday.
"With Barnsie, we were trying to get another table-setter that can run up in front of the middle of our lineup," Weiss said. "It's just mixing it up a little bit.
"Nolan has hit in a bunch of different spots in the lineup. It's not too big of a deal."
Thomas Harding is a reporter for MLB.com. Follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.