With Santiago as assistant coach for two years under Carlos Retegui, the transition to becoming coach has been smooth for the women, too.
"He's different and trying to introduce some new things with Luciana not here. She was involved in doing certain things that no one else can do so she was very important for us," says the 30-year-old Ciudad de Buenos Aires club player.
While the Bay tourney for them, as it is for other seven nations, offers ideal preparation for the FIH World League Olympic qualifiers in Valcencia, Spain, in June-July, it also is an opportune time to build a template with a pool of young blood following the retirement of Aymer, Agustina Soledad Garcia and the likes.
"It's a whole new team so we needed the [retired] players and, of course, Luciana was the best so it's been difficult to play without her in the field but we're trying to build a new system with the new players so ... this is the moment of transition."
Rebecchi says the desire to be world No1 and the goal of winning everything they play are still the primary motivators although she accepts it'll be a little harder with the new crop.
"I think we [had] a very good match [but] we couldn't score. I thought we had more chances than them [Black Sticks] and the goals didn't want to go inside but we played very well."
Luck, she believes, had a hand in Sunday's stumble against the Black Sticks whereas in their 7-1 victory in the Gisborne warm-up match the balls found the net.
However, that simplicity doesn't lend credence to that cup game where the Argies, clad in pink and as adroit as they are, opted to put their heads down to take on numerous Kiwis. Using peripheral vision to spy gaps and letting the ball do the talking through elementary passes should have prevailed.
The entire team are shouldering that pressure, not just those stoking the engine room.
Rebecchi is extramurally pursuing a degree in graphic artistry in Buenos Aries but "it isn't easy when you train every day".
She doesn't know how long she'll carry on representing her country but fancies the prospect of making the Rio Olympics next year.
Rebecchi has golds from the 2010 Rosario World Cup and several Champions Trophy and Pan American Games but that medal has proved elusive in the Olympics - the team won silver at the 2012 London Olympics - so gold at Rio will be godsend.
"Olympic [gold] is the one Argentina is missing so it'll be great."
Her mother Gabriela is a retired goalkeeper so it doesn't come as a surprise that Rebecchi played from the age of 6.
"I don't know, she never put me there [goalkeeper's position]," she says with a laugh when asked why Rebecchi didn't follow in her mother's footsteps.
Her selection into the Argentina Under-21 team, when she was 17, reinforced her belief that she could make it to the national team for the No1 female sport in her country.
Rebecchi, who has scored 123 international goals, believes a light switches on inside the head of pedigree strikers the second they enter the attacking circle.
