Re: takedown in iriminage
Uke has do understand his/her role when practicing Iriminage.
As you make Uke turn and redirect his power downwards, he naturally wants to get back and have his back straight. As he tries to get back we use his power to throw him.
Stubborn Uke shows that he does not understand yet the natural reactions and the way Aikido techniques should be practiced.
please look at the way Ueshiba (three generations) execute Iriminage.