Having re-read the Press statement, it says
It should be noted that riders who compete in Heat 14 cannot also compete in Heat 15. It will be the team managers’ decision whether to leave certain riders out of the Heat 14 poll should they wish to be certain of their availability for Heat 15.
so riders 3 to 6 nominated if you leave your heat leaders out for the last heat, who is the most supported team in the league on Twitter?
guaranteed to have the reserve in heat 14