Re: Being overly complacent as Uke
Uke shouldn't move unless moved; ukemi really should be an attempt to regain a stable posture from which to fight back. I think of it this way: If Aikido is about leaning correct body mechanics and uke co-operates with me how does that help me work on my body mechanics? That just creates an illusion of competance and so the more I move into a teaching role the less useful I find a co-operative uke.
Uke is a role for the analysis of what tori is doing; if uke is working to produce the technique then it's fudging the results of tori's technique.