Yoda knew the whole time that Luke was on the same path as his dad. He was reluctant to train him and said, famously, that “all is now lost” when he took off from Dagobah to save his friends. The most striking part of this whole sequence (Luke’s training with Yoda) is The Cave.
Very intriguing theory. Looking forward to see how these theories work out. This would explain why Luke is neither in the trailer or the poster. In a couple of weeks we will figure out.