Congrats on the job.
Its not personal and the thing is the approach to hiring FOs is pretty much exactly the same. And any way if it is personal you are probably better off not working there anyway.
Any cv more than 2 weeks old is out of date and when you want someone you want them now. If someone leaves for the shiny jet job this morning then first guy through the door this afternoon to fill FI position gets the job.
Think of it from the CFIs position. Suppose he files the suitable cvs in order and starts calling them. How many will be saying yes please and how many will be saying sorry mate thanks for the offer but I got a much better job last week. Before long he's a bit hacked off and the next knock on the door is someone with a fresh FI and a shiny cv and he can start today. Who gets the job.
Lesson is if you want the job keep turning up and keep handing in CVs (even if all you have added is one more hour). One day , sooner rather than later they will have a pressing need and instead of 'No thanks' its 'Hang on you may have called at the right time'.
It happens all of the time to everyone.