I am not really doubting that Washington can learn, it is just that I will believe it when I see it. So many ways for things to go sideways.
I would add "not stupid" to your equation. I think that Bryant's biggest problem is/was not lack of effort but he isn't clever enough to put together the various parts that go into being a complete NFL WR. As I in I suspect that he barely knows the playbook and has no ability to connect the abstract concepts of # of steps into and out of a break to "doing good on the field" and is assuming that his superior talent will always get him by -- because when has it not?