I don't know man, this is a good question.
The plants that I'm growing now were started at exactly the same time. One plant named "Helen" poked out of the ground about 5 hours before the other (Shelly). But after germination, Helen was about 6-8 days behind on growing it's first set of leaves and I had almost given up on her. Helen was quite a bit shorter, but grew and stretched until it was about matched with "Shelly" who was nice and bushy and tall. Helen never got as bushy but did get within 2" of height and started flowering at basically the same time as Shelly did.
Shelly did show trichomes about 2-3 days before Helen did. And currently, Helen, who has been trying to "catch up" to Shelly this whole time, is now showing much more amber in her pistols then her better looking sister. It almost seems that Helen wants to finish before Shelly, even when Helen has been behind the entire grow...