The difference in wages is huge that's why we'd like to replace Llorente with Zaza I guess. Assuming we'd pay Zaza 1.5m net he'd cost us 3m gross. In comparison Llorente costs us 9m per season (gross). If you consider we'd have to pay for Zaza 15m and we could sell Llorente for let's say 8m Zaza is the cheaper option considering Llorente's contract length.
We're not growing fast enough in terms of revenue so I think the management has to look for savings, on wages especially. Llorente isn't really contributing too much this season to the team and it's wise to try get rid of his salary. Same thing goes for Giovinco and Pepe. To some extent I'd even put Pirlo there too.
Overall I think Llorente is not a bad player but he suffers from the coach and in the process - system change. Under Conte we played ball into air much more, now we play with more short passes and require more movement from the players. Zaza is way more mobile, faster and aggressive so he'd suit our game much better. He's far from a dream signing nut we're not growing fast enough to sign the likes of Cavani and Falcao.