I'm not sure if that is the answer. "Everyone should spend one year driving crash up derby before driving on public roads".
Driving a car on public roads has nothing to do with crash up derby, nor does the latter have to do with bike racing. Remco did his first pro years, what he could have done in the under-23 ranks, where the speeds are higher than the juniors, but less than the pros. A developing rider has the opportunity to acclimate to the ever increasing speeds and distances as he moves up the ladder. Instead, Remco went from the lower speeds, with shorter distances, to the highest speeds and longest distances overnight, without an intermediate level to hone his craft. He was ready physically for the pros but, in his personal case, not technically and it probably almost cost his life in Lombardia.