Besides, there's nothing to say that Bruce doesn't come back, to help train Blake into the role, kinda like Batman Beyond.
I agree and that was the point I was getting at. He has made his first step but it's a long journey. I doubt the night he found the cave he goes out in the suit right away. He had no knowlege of Bruce's tech or methods. He will have to explore and understand everything in the cave. No way Bruce would not guide him in some way.