Papalii won't lead the Blues in their first preseason hit out against the Hurricanes in Wellington on Sunday as the All Blacks are gradually reintegrated into the squad.
When Papalii accepts the leadership mantle for the opening match against Moana Pasifika, though, MacDonald knows he will set the benchmark with his typically relentless actions.
While young, Papalii has been in the Blues for four years and is a bolted-on starter in the No 7 jersey, having made a notable impression in that role for the All Blacks last year. His performances against Wales and Ireland in particular confirmed he would be a regular presence at test level for many years to come.
"Dalton has been a leader in our squad for a few years," MacDonald said. "Although he's pretty young he's been around for a while. He gets what this team is about – he's very passionate about the Blues. He plays with his heart every week and what he says he goes out and does it. As a team we're trying to make sure we front every week, and that's one of Dalton's big strengths."
Papalii led the Blues once last season in Tuipulotu's injury absence – in the defeat to the Crusaders in Christchurch. His biggest takeaway from that testing experience was how to navigate the responsibility of speaking with referees.
"Probably being calm on the field. Sometimes me and the ref don't agree so it's about building that relationship, making sure I'm not on the wrong side of his decisions and not arguing with them; actually having a conversation. That's the biggest lesson I took out of that."
After claiming the transtasman title last year MacDonald is well aware the Blues have a target on the back but he is imploring his team to embrace the weight of expectation as they depart for the Queenstown bubble.
"We've got to play like that is the case. If we want to be a championship-winning team you've got to learn to play as favourites and not get ahead of ourselves. At times we've got caught out there so we've got to make sure we don't get distracted by those sorts of things.
"We've had a lot of adversity in the last 12 months so this is an opportunity to make sure we do play so everyone is excited about that."