It was previously possible for a 2nd tier rider to 'dip their toe' in the top league in the knowledge that they could re enter tier 2 after 1 season out on the previously achieved average rather than a conversion if it didnt work out rather than be saddled with an unattractive conversion.
However ZW is not dropping back down - he is doubling up - so it isnt that it hasnt worked out.
Also with the reset of averages in 2017 that realligned makes the situation less relevant going forward.
Even using his 2016 figure he was above 2