Not much to add to those good replies.
I don't believe, that Tournament driven training is recommendable cross training.
I disagree with this. One thing Aikido doesn't develp particularly well is the things that you get from the competitve einvironment - such as the ability to keep your head and access your skills under the pressure of true resistance and competition.
I personally don't think that we should look to add that to Aikido - if we it ceases to be Aikido in my mind. But do like the idea of cross training in other forms that do develop those abiities - which can then be transferred to your Aikido skill.