He's a competitor. Gardiner really hates being beaten, an essential trait when playing on opponents who are often bigger and stronger than him. He's a good spoiler, has courage, and is generally a reliable mark and kick when starting his team's rebound. His games on Boyd – he also played against the likely No.1 pick in a Vic Country v Vic Metro trial match – showed his aggressive streak. Going forward for any long stretch is going to be unlikely at AFL level but because his marking is good, it is a pinch-hit option.
The main query on Gardiner is his height. Because he stands about 192cm, when he progresses to an AFL environment he will probably only be able to play as a third tall. That's fine, but it means recruiters would love him to have an extra two or three centimetres of growth left in him.
Started the season probably ranked a little higher, but is still likely to be picked somewhere from 15-30.
Gardiner has the survival instincts of all the defenders. He nudges, niggles and annoys forwards, and often beats them. One of not many quality taller defenders around.