Traditionally, Japanese people wish long live to the emperor with a gesture of the arms towards the sky which means: "Ten thousand years for the emperor!", "banzai" in Japanese language. In Aikido, that form is necessary for some entries.
The only sign in your body which allows to anticipate the direction of your entry is your front foot. That is an important reason for wearing a hakama as it hides your footwork for a short time to your opponent, a precious time for the rest of the movement.
In a group attack, the more unexpected your action will be, the better you will disorientate their attack.
The movement used here allows moving in all directions easily without preference. It is happo giri. Mastering happo giri is only possible through a deep practice and study of aiki ken.
In Aikido demonstrations, when tori applies kote gaeshi, he does not lock the arm, thus allowing uke to fall forward (ma ukemi). That way of doing is spectacular and can be justified in some cases. But in reality, when kote gaeshi is applied in uke's rear with all its martial dimension, uke just can't do anything else but a back fall otherwise his shoulder would be dislocated.
Aikido is not a sport, it is a martial art which laws (takemusu) are in harmony with the laws of the universe. Studying them allows the practitioner to understand his place in the universe. Aikido was born in Iwama, O sensei achieved in that village the synthesis of tai jutsu, aiki ken and aiki jo.
The International Takemusu Aikido Federation (ITAF) brings to the practitioner the structure he needs in order to work as close as possible to the reality O sensei MU defined. The official national representations are the guarantee of a teaching faithful to the Founder's.
In modern Aikido, weapons are hardly taught, if taught at all. In O sensei's Aikido, on the contrary, aiki ken, aiki jo and tai jutsu are unified and form together a riai, a family of harmonious techniques stemming from one unique principle. Each techniques helps understand all the others.
Peace is a balance between a human being and the world around him. The true martial art's goal is not to become stronger than one's opponent but to find in that opponent a way to realize harmony. There is no enemy anymore as such, but an opportunity offered to reach unified ki.