There are a lot of routes to the cockpit of an airline, my suggestion is do your research and pick the one that fits you the best. I have never been up to ATA to check them out, but I'm sure their programs work for some people.
I will clear up one small point, an instructor at FSI with 1200tt will most likely have around
900 hours of dual given and
500 hours of multi time due to the structure of the program. This is time gained thru employement, while applicant "A" has never held a flight job before. That changes the comparision to a certain degree.