Massey White had previous gone unbeaten in the competition until Metro arrived on the scene and much depends on the time of year to determine their strength.
Massey White is the top Massey University side below premier and senior grade, so during holiday time they are the go to side for the higher assessed teams seeking to replace key players away on leave.
Cosford said his Metro lads were keen to get a gauge of where they were at early in the competition and Saturday's home match against Massey White would be the barometer.
"We have six players from last season and the rest are new from various backgrounds, although most are from Whanganui High School," Cosford said.
"We are pretty happy with where the boys are in training and we are comfortable with the talent we have across the board, but game time will tell the full story. We had really good pre-season hitout against the older and more experienced senior B players in Marist Celtic just last Saturday at Spriggens.
"We went very well and held our own against some hardened, experienced players - we're good to go on Saturday," Cosford said.