Sure there's much more to Aiki principles. I guess the question becomes, can a Judoka, Jujutsuka use Aiki principles in there Judo/Jujutsu? I think this is what Roy Dean has been trying to demonstrate in his approach to martials arts in general. Roy Dean knows Aikido, he is a 1st dan, but incoporates Aiki in his BJJ. I think he has a great approach to Aiki and self defense.
http://www.youtube.com/watch?v=SivWAcPlzFg