My point is about the level of coaching input (elite versus father), not their absolute speed when comparing the age difference of 2 years and 4 months.
By the way JW will not be going to university until October 2012, you have gained a year in your calculations.
JW has actually improved in that 2 year age gap to be #1 in the world, which suggests the coaching regime is appropriate.
Does HC have the option of elite level support yet or is she too young ?