Menifee\'s runners improve 4 3/4 points on average, but few if any ever ran a 1 as a 2yo, so it\'s unlikely this filly is a late developer-- she\'s unlikely to run neg 4\'s, especially since she hasn\'t been able to break through the 1 level in 9 months.
But yes, as a general question I do look at developmental tendencies in sires, especially when recommending buys.
As far as this filly goes, it took her 4 1/2 months to get back to the number BOTH times after she ran it. Could she pair up? Sure. But at 2-1 or less (which she will be) I\'ll take my chances. If she goes back as far as she has after every other time she has run a 3 or better, she could be out of the tri, let alone the win spot.