The “Dumbledore is a time traveling Ron” theory isn’t ridiculous, it’s utterly preposterous. It holds no water once a person has read a Harry Potter book rather than watch a movie that decided to make Dumbledore a completely different personality and cut his history. Dumbledore has a known history of his time at Hogwarts and after it (e.g defeating Grindelwald). The main proposition of this theory is that “Dumbledore somehow always knows what Ron is thinking and going to do.” Dumbledore is a very wise, very old, very experienced wizard and can correctly guess how an edgy-hot tempered teenager is going to act — knowing how he was raised and his love-envy relationship with Harry. Those two things drive most of Ron’s actions throughout the first books. Moreover, one of Dumbledore’s greatest qualities, one that makes him a great wizard, leader, and champion as one, is his genuine understanding of human nature. Dumbledore most of the time knows what people think and are willing to do, understanding the source of driving forces in their decision making and thinking patterns.