He has worked under most of that coaching staff, Dave Rennie and Tom Coventry with the 2010 NZ Under 20s, and Andrew Strawbridge with Auckland in 2010-11.
Coventry liked what he saw from Polwart in 2014, but he was already on the Chiefs' radar: "He was involved a lot more - he's always been good over the ball - but his handling and general play was quality, too."
It is astonishing that Polwart has played just a handful of Super games - off the Blues bench - since his 2011 debut, but the way to his "home" franchise was blocked by Luke Braid and Brendon O'Connor. Polwart is philosophical about the dead-end at the Blues.
"The competition will help me stay focused," he said. "This year I really have to take any opportunity I can get."
That competition is All Black No7 Sam Cane and 38-test Japan loose forward Michael Leitch, who arrives late next month, not to forget Tevita Koloamatangi.
If Polwart can replicate his club and provincial form in the Super Rugby arena, then the Chiefs will have once more signed an under the radar, unheralded gem.