Shortland said Kemp had suffered a significant blow to the head while making a tackle during a game on March 8, 2014 and was stood down under the Northland Rugby Union's 'blue card' system. Kemp was the first person issued with a blue card, which is a stand-down for any player who received a head knock and a suspected concussion.
A player issued with a blue card must leave the field of play immediately and is prevented from playing rugby or resuming contact training until they have a concussion clearance notice, which requires clearance from a doctor. Kemp was cleared to play about a month later.
Kemp also suffered a head injury when he fell off his bike about seven or eight years previously.
Shortland said forensic pathologist Dr Fintan Garavan believed that the head injury Kemp sustained on July 5, effectively led to a re-bleed of the head injury he sustained on March 8.
Shortland said New Zealand Rugby, with the assistance of ACC, was leading the way with its RugbySmart v2.0 community concussion education programme, which seeks to educate players directly and general practitioners. He said the programme was making everybody involved in the game proactive in keeping players safe as much as possible.
"It is now mandatory to pull players off the field when it is suspected they may have suffered a head injury," Shortland said.
"It is the referees, coaches, administrators and players themselves that are being directly educated to watch out for such signs and to be proactive in protecting individuals as much as possible form head injuries."
He also acknowledged the efforts of the Northland Rugby Union in initiating the blue card system.
"It should be acknowledged that Jordan's death has had an impact on the rugby community both in Northland and wider, which has been a catalyst for change and further education and processes around identifying the risks and potential injuries that come from playing rugby," Shortland said.
"Jordan's death is one of two rugby deaths within 12 months of each other that has strengthened the resolution to keep honing the processes to help restrict injury and death."