I think, believe it or not, that AD is being pretty sincere in his process.
He had VERY high standards for his play, and I doubt that has changed.
If he feels he would be going out there, taking someone else's job, and would look mediocre - especially when beside Garrett - I think he legitimately says no to coming back.
And if that's the case (that he is basing his decision on whether he can still be that impact player), then we should be happy no matter what the answer ultimately is. He either says yes, and we get AD back - the good AD - or he passes and we're ok with that we have on the field.