I don't see why Zaragoza players should be punished more or same as Levante players and Zaragoza President for this. First question will be, how much they knew. For those of you who follow Cricket and know about fixing scams in it, in no instance was whole team was aware of fixing. It is generally few individuals and they took money to 'lose' or do something negative to what they are supposed to do. Here, Levante players took money to lose and Zaragoza president initiated it.
So, the question will be, what did Zaragoza president told players while transferring money and taking it out from them, if at all he told. Maybe few players knew, others didn't. For me, if this is proved, more guilty parties are Zaragoza president, coach (who definitely must have been aware) and Levante players. If some/all Zaragoza players knew that Levante are going to throw away match and they are being 'used' in money transfer, their fault is of not disclosing it to authorities. They themselves haven't 'fixed' the game here.