More than one i would like. Of my experience and by observation of videos, i see that neglecting how to shortening the distance to arrive at the contact, of a safe way, without exposing to contra attacks. In other words, to make emphasis in trapping before grappling.
Another point is the necessity of the implantation of atemi waza from the beginning of the aikido practices. And nonsingle that, how to learn to uniting atemis to the techniques, in such a way that flowing of the movement is not affected.
Another thing is the suwariwaza, seems to me that too much importance to this work, when is only a exercise without no "real" practical application. To exercise a strong displacement, balance and energy, there are many other exercises that do not hurt our knees !!
This is my 3 cents.