Whenever people discuss Mitzvos there are those yelling that Tzedakka is better and more important, and that a bigger deal should be made of it. Now that it was done, still no good?
And yes, the Gemara says Tzaddik Moshel. And Chazal is full of people asking Chachamim and Tzadikim to Daven for them. In fact, Avimelech was advised in his Nevua to have a Navi Daven for him.