I'm not knightmare but My bet is on his 20m sprint.
From the Mitch Grigg thread in Draft Watch:
I'll think you might find Griggs 20 metres times were hindered by the fact he kept breaking the beam with his arm setting off the timer before he took off thereby adding time to the result. Several kids did the same thing.
1 lad had a 4.35 result on 1 run then on the next when he got his start right he was back to 3.1.
Such is life.
And also:
Mitch Grigg - 3.19sec 20m sprint, 15.1 beep test
Steele Sidebottom - 3.25sec 20m sprint, 14.5 beep test