The 18-year-old has already made 10 appearances for the north London side but has been granted permission to move to Fratton Park this summer to help his development.
And while his striker partner received all the post-match applause after his brace, Scarlett’s performance also stood out as he proved a cut above what Blues fans have been awed with. used in recent seasons.
The only thing missing from his game was a goal, which would have been fully deserved before being replaced by Joe Pigott in the 67th minute.
Still, that didn’t impact Cowley’s assessment of the youngster.
The Pompey boss believes Scarlett has a big future ahead of him – and the Blues will take advantage of it this season.
Hailing his latest performance, Cowley told The News: “He plays like two players, the way he plays.”
“I’ve never seen a boy so young who plays, not just with intensity in the press but with intelligence in his press.
“He just knows the angles, knows when to run, knows when to stay and the way he cuts space for the defender.
I think he is on a trip.
“He’s just a lovely, humble boy and he’s going to be up there.
“You have to remember this is his first time playing senior league football.
“He’s had a taste of some cup games with Tottenham, but with the games for us coming fast and well, he’s definitely going to grow and develop during this time.”
Scarlett’s inclusion in the starting XI at Whaddon Road saw fellow loanee Pigott fall to the bench.
His pairing with Bishop was only the second time they played together.
However, Cowley was impressed with what he saw.
‘I thought they were really good. I think they can be a very good partnership,” the manager said.
“I thought Colby was leading the line brilliantly.
“He was a real handful and carried such a goal threat, whereas Dane just has such energy and intensity about him.
“Whether it’s pressing down and getting in the face of defenders and disrupting their rhythm, or running behind them and getting behind.”
“It’s a partnership that looks good for us and as I’ve said before we know we’re not going to be good in numbers but we have to make sure that the numbers we have are all contributing and that we have real confidence in them.
“With the amount of games we have, we need specific people for how we want to play and need to be able to keep it fresh.”