I have followed messi mood ever since saurez joined barca , I notice his mood has been good, groovy and he looks happy and because of that he has fed saurez many assist to score, unlike when zlatan joined with his bossy character which affected messi and barca not to be happy. Saurez is humble hence messi liked someone like that, neymar was not humble but was thought how important it will be for him to be and he followed suit. The above are my opinions..u can add urs if u know better why messi is happy.