Okay a week late but I think I've found an example of seiryoku zenyo. The simplist example I can think of is taking your opponent off balance before using a throw. This doesn't mean forcing the opponent to do this with strength, but rather allowing them to step into it on their own and then take advantage of how they've stepped. When using a titoshi I have too open out and lift the opponent slightly and take a very small step back. This puts the opponent on their toes. This is where seiryoku zenyo is used as now that the opponent is off balance it takes practically no effort to throw them over.