Recommendations
Those of you who made it to the airlines can appreciate the fact that being able to fly the perfect NDB approach or knowing everything about air law are the least important bits in being an airline pilot.
Everybody knows one or two guys in their airline who are very good pilots technically speaking but don't really fit in or even worse than that - no one wants to fly with them.
Where does this put the CRM and the safety of the flight?
Recommendations are based on overall impression.
The impression you made on the guys in Jerez is most probably the impression you are going to make on the guys in your airline.
Add to that the fact that recommendations are a matter of supply and demand at the time of graduation.