Even though there might be 2000 candidates applying, it doesnt mean you have 2000+ adequate, unemployed, pilots sitting there waiting for the merci of a sm1 taking them.
As the grass frequently appears to be greener at your neighbor, so for many pilots here jobs seems to be better at the other company. So there are many guys from Web, tam, G3, passaredo, AD, applying to eachother company. Most companies in Brazil dont value seniority, so your salary will stay the same if you are 1st year or 10th, this motivates many to look for the shorter way to upgrade.