Yes, if he improve enough to ask for more salary. If he improves a little bit, he will not ask for more salary, but if his improve is enough (for example from CA6 to CA7) he will go to unhappy status, asking for more salary. BUT, if the salary is over his normal salary, he will not ask for it. I mean, if you bid for a CA5 with a salary of 30K, when his normal salary is 1,500 he will not ask more when he arrives to CA7 (with a normal salary of 6.000, for example).