Paewai pointed out Kaka, 22, is reaping the benefits of a change in attitude towards training.
"Gillies has always had the skill and ability but his change in attitude towards getting his fitness levels up is really paying off now."
Former New Zealand Maori representative and Magpies centurion Paewai believes Kaka will become the complete sevens player if he can become more dominant at tackle time.
"He has to dominate the tackle and try and get more turnovers."
Paewai said he won't be short on ammunition when asking Tietjens for Kaka's services at Waipukurau.
"Four of Titch's senior players, Lote Raikabula, DJ Forbes, Tomasi Cama and Tim Mikkelson didn't play at the Queenstown nationals and it showed in Wellington."
Speaking after the playoff for third, Tietjens said Kaka was outstanding when playing all three games on Saturday. He was also impressed with the other newcomer, Rocky Khan, and said both are players for the future.
Former Magpie Mark Jackman of Canterbury, who had an outstanding Wellington Sevens last year, and Aucklander Milford Keresoma will replace Kurt Baker and captain Forbes in the All Black Sevens side which travels to Las Vegas today to prepare for this weekend's fifth round in the series.
Napier Boys' High School product Chris Brightwell was a member of the England team which beat Kenya 24-19 in a thrilling extra time final.
Hastings Rugby and Sports were beaten 48-7 by Ardmore Marist in the final of the New Zealand Marist Sevens tournament in Wellington on Saturday.
"We just didn't get our hands on the ball. But I'm proud of the way our boys worked to get to the final," Hastings coach Jeff Karika said.
His troops beat Napier Old Boys Marist 28-5 in the semifinals. Star Timu, 17-year-old speedster Mason Emerson, Ausage Fomai and Luke Makris were all prominent for Hastings during the two-day tournament.
Timu and Napier's Brad Weber were the two Bay players named in the New Zealand Marist sevens team to play in a Samoa tournament later this month.