We already established that Ueshiba himself was not a good teacher.
Has that been established? The successful transmission of internal skill from teacher to student is a rare thing under the best of circumstances. Perhaps Ueshiba did not conform to the modern pedagogical standard of spoonfeeding meticulously-analyzed concepts and baby-step students through basics . . . but at least some of his students (Shirata? Tomiki? Shioda with later influence from Kodokai? and others that have been pointed out on this forum over the years) achieved a decent understanding and ability to manifest internal connection and power--something they probably did not have a clue about before training with Ueshiba.