Re: Aikido & Judo
I've always taken a page from Tomiki sensei who was well versed in both arts. He said that aikido was judo at a distance. Building off what Chris wrote then aikido becomes more difficult because one has to apply the priciples of judo over more distance and with less contact.
I wonder if the internal skill set that Rob mentions might be better classified as atributes rather than skills. If so then the skills of aikido or judo would be greatly enhanced when performed by someone with the atributes produced by the core skill set.