Worth reading if only to prove that the pigeons can confound you choose which country they are in.
Not forgetting that the one loft birds are not on the darkness system.
There has been hundreds of explanations for the vast differences in the velocities of different pigeons in the same race but they are just pure speculation and until a pigeon can talk that will be the case
There would be no point in the sport if everything was straight forward, it is the indefinable that make it interesting. and long may it be so.
Regards.