I doubt Perez has ever dreamed of what McLaren does to prepare a driver to race generally, and what the team does to prepare for each event. McLaren made Lewis what he is (he will fade from that at Mercedes) and they improved Jensen as a driver. If Perez embraces the McLaren system, he will reach his full potential. Whether that realized potential is as good as Lewis', only time will tell.
Perez has brilliant speed but very little race intelligence. He's nowhere near Lewis or Sebastian now and won't be at the end of the winter. I highly doubt he will stay with McLaren for longer than one or two seasons.