"They're the ones, that it's a chance to pull teams back now.
"Tough games, but the ball's in our court."
Whanganui looked to be running themselves into some form in the 48-13 win in Taupo over King Country and their All Black Sam Cane, as they scored three tries in the dying minutes.
After a season with some head-scratching referee and touch judge calls, there was another at Owen Delany Park following Whanganui's seventh try, as the team rushed back to halfway, only to be informed by the official that time had expired.
"I asked Darryl [Robinson, manager], who said there was still three-four minutes, the commentators thought there was five," said Caskey.
"We missed an opportunity to get some more for points differential."
Captain Campbell Hart and fellow flanker Jamie Hughes, who came into the original preseason with injuries, were at their determined best in Taupo.
Hart's lineout work was crucial with Whanganui missing the injured Peter-Travis Hay-Horton, while Hughes had to draw Cane's admiration with his workrate.
"To be fair, I would expect our forwards to be dominant against King Country," said Caskey.
"We have to keep stepping up a notch every week.
"South Canterbury will be a step up again. But one week at a time."
Indeed, undefeated Horowhenua-Kapiti have been winning tight matches all campaign, holding off West Coast (28-21) and Buller (27-12) in games down the South Island's far coast, while defending home turf in Levin against North Otago (25-17) and East Coast (38-31).
"Nothing's changed too much to what they've been in previous years," said Caskey.
The visitors play a forward-oriented game – led by their inspiring lock Ryan Shelford, while fellow lock Daniel Smith and hooker Bryn Gordon top the try-scorers list with three each.
Of concern to Whanganui, with their knack for giving away infringements, is the match-winning kicking form of halfback Jack Tatu-Robinson, who has coolly slotted 12 conversions and eight penalties so far this campaign for 48 points in matches that were not blowouts.
As well as Ezra Malo having made his debut last weekend, prop and fellow Heartland Hurricanes Under 20 rep Keightley Watson resumes training with the squad, both of them the 2021 apprentice players.
Lock Josefa Rokotakala and hooker/prop Jack van Bussel return from the completed Whanganui Development XV season, with van Bussel having previously made his Heartland debut of the bench against Wairarapa Bush when Dylan Gallien was unavailable.
Kickoff will be at 2.30pm.