Buttler made both his one-day international and Twenty20 debuts in teams containing Pietersen, but only 13 of the 23-year-old's 52 limited-overs caps to date have coincided with the availability of England's record runscorer.
There will be no more reunions, of course, after England's controversial decision to call time on Pietersen's international career in the aftermath of this winter's Ashes drubbing.
The England and Wales Cricket Board has set its sights on a future without Pietersen - one in which, according to its statement two weeks ago, it is hoped "everyone... (will be) able to trust each other".
Wicketkeeper-batsman Buttler will be one of those required to demonstrate England can prosper without Pietersen.
As he prepares for the start of two limited-overs series against West Indies - three ODIs in Antigua and three Twenty20s in Barbados - he makes it clear he found Pietersen's advice invaluable in the short cross-over of their careers.
"The calibre of player that Kevin was, it was great to be around him," said Buttler.
"Personally, I liked to try and ask him as many questions as I could - as everyone usually does, when you've got people who are that good.
"It's good to try to pick their brains, and he was a great player for England.
"But that decision has been made, and now we have to move on as a team - and we can do that here, starting this week."
England badly need some early successes against the Windies, to try to rebalance a damning 12-1 scoreline as Australia simply kept beating them across all formats this winter.
Stuart Broad, who will captain England here in both limited-overs formats and then again in his permanent role at the ICC World Twenty20 in Bangladesh, has called on the new generation of "match-winners" to fill the vacancy left by Pietersen.
"They are some big shoes to fill - obviously he was a great player," said Buttler.
"But... everyone has moved on from that now.
"I think there are a lot of match-winners in our dressing room, and now is a great opportunity for guys to step forward and try to emulate some of the success that Kevin had.
"If they do that for themselves, we can really drive this new era.
"There is so much excitement around the group, new faces and new ideas as well."
Buttler's own international career is little more than two years old, but in his pivotal position he hopes he can help others find their feet too.
"I'm still pretty young, but I've played a little bit now and had some really good experiences in my international career that I've learned from a lot," he added.
"If I can pass on any knowledge to guys coming in, that's great.
"Obviously as a wicketkeeper, it's your role in the field to really drive that - and it's something I think I've grown into better as I've played a few more games.
"It's very exciting... some new faces around, a lot of fresh energy and a couple of guys on their first tour."
Lending a more mature hand on this trip is Paul Collingwood, brought in as limited-overs coach Ashley Giles' temporary assistant.
Buttler is already impressed.
"Paul Collingwood is a different voice, with the experience he's got," he said.
"He's obviously got a lot of energy for the game, and a lot of knowledge.
"It's great to have him around."
England have a mix, by necessity, of young and old as they try to find a formula to get themselves back on track.
Tuesday's fixture against a University of West Indies Vice Chancellor's team at the Sir Vivian Richards Stadium will be their only warm-up match before the first ODI at the same venue three days later.
A largely unfamiliar UWI line-up awaits them, although wicketkeeper Devon Thomas and opener Adrian Barath have both played for the Windies - as has fast bowler Miguel Cummins after his ODI debut against Ireland on Sunday.
England's developing team must gel and adapt - but after the miserable Ashes tour, time is a commodity in short supply.
Buttler appears to know that only too well.
"We're looking forward to a real hard series," he said.
"What everyone wants is a series win. You gain a lot of confidence from winning games of cricket.
"We really need to start doing that."
England (possible, v UWI Vice Chancellor's XI at the Sir Vivian Richards Stadium): SCJ Broad (Captain), AD Hales, MM Ali, JE Root, BA Stokes, EJG Morgan, RS Bopara, JC Buttler (wkt), TT Bresnan, CJ Jordan, SD Parry