I never thought of the gardener being Jesus. But if it is Jesus, I don't see he gardener changing his mind, he just wants to give the fig tree another chance. Remember it is a parable.
John 12:49 For I have not spoken on my own authority, but the Father who sent me has himself given me a commandment—what to say and what to speak.
John 5:19 So Jesus said to them, “Truly, truly, I say to you, the Son can do nothing of his own accord, but only what he sees the Father doing. For whatever the Father does, that the Son does likewise.