The feeling of The whole body contributes to aiki. If you only look at the hand or arm ….it’s missing the other parts. Pulling intent in 6 directions, moving from tanden, using less tension and softness and less muscles. Daito Ryu aiki is amazing.
A person cannot counter forces in three directions at once. Three is half of six -- six directions, or "roppo". Thus, a person who is in "6 directions" who can manipulate someone in 3 under any circumstances feels like they are invincible.