Of the XV that started Scotland's valiant 24-16 loss to New Zealand on Saturday, ten ply their trade for the GUINNESS PRO12 outfit.
Cowan believes the likes of 24-year-old flanker Rob Harley and 20-year-old No.8 Adam Ashe shone against the All Blacks and will only go from strength to strength over time.
And the flanker, who won his fifth Scotland cap against New Zealand, also singled out Warriors lock Jonny Gray, in addition to his brother Richie, as key cogs moving forward.
"They are outstanding at the lineout and they take great pride in it," said Cowan, who plays his club rugby for London Irish. "They run it during the week and take control of it, and it's something we want to keep progressing.
"We know our roles in the back row. Rob Harley was exceptional out there - he's very accurate in what he does.
"He's not just a loony out there - he brings controlled chaos and is very good at it.
"Adam Ashe is one for the future and is going to be a star. He doesn't fear contact and will run that ball and be brisk with it.
"I was very impressed by us from one to 23 and I sensed the All Blacks were a little bit taken aback.
"They made simple errors which were very uncharacteristic but, as the All Blacks do, they are very good at regrouping and coming at you again."
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