Originally (years back) when I did this I noticed that I had Uke‘s arm, but just his arm. He would be doubled over with both his legs bent but I would have his arm. I realized that it is my job as nage to help him help himself into a better stance. Today, I can put this into words as we practiced it a lot tonight:

Both in migi aihanmi: Assuming for the moment Uke is blending, use tegatana and a small rotation of your right wrist to bring your tegatana to the outside of Uke‘s wrist. Extend your right arm and slide to the side while protecting your groin (bring your left leg with you!) so that Uke‘s arm is extended to the right at its maximum. Keep your left grip on his elbow using your thumb to control his elbow at the ulnar nerve. If his right arm is extended horizontally, you should have enough room to walk past him had his arm not been there.

If Uke is resistant or you are too late in reacting, you need to vary your ‘small circle’ mentioned above. In this case, you can only extend Uke‘s arm forwards (toward yourself). To do this safely, the rotation resembles a kokyunage pre-throw. Actually pivot your hips so your hara is facing perpendicular to Uke as you draw a big vertical circle. On the apex of the large vertical circle, start pivoting your hips back toward Uke. You can slide to the outside at the same time as all of this if you are well coordinated. Extend Uke out sideways and continue the ikkyo omote.