37 seemed to be the fastest but that’s on grass- tough for most but not so tough for Asafa.
Another point in all this is convergence- both programs move towards the events and when one aspect is already as good as it’s likely ever going to get, you may move through that aspect sooner.
In 1988, Ben was breaking WRs in 50y etc even though he was getting out behind the field sometimes. he was strong enough but hadn’t done a great number of block starts before the comp period and let the meets bring the feel for starts back.
It appears as though something similar happened with Bolt in 2009 as his starts came back to 2008 level at the WCs- and he was totally confident they would with minimal emphasis and he said so.