I don't think Cook did any worse than any other track reserve anywhere else would do at that stage. The riders he was up against had been racing the track, they knew how it had changed, they knew where the lines were, the ruts etc. It can't be easy to step in at that level over half way through a meeting and seriously expect to compete. Same with Auty. Cook would be a great addition to the England team (sorry I mean great britain) For too long fb have fielded the same faces over and over with no success. They wait until these guys are mid 20s instead of breaking them in earlier and giving them that experience. Cook is an exception as he is new to the sport so was around to be selected in his teens.
This topic will ultimately lead back to early years training and the sheer lack of facilities. Until that changes no GB team are going to compete on the world stage at a consistently high level. There may be spikes in performance where there is a few good riders appear but there will be little to no real talent to back that up.