imagine if you will one man intent on only taking ukemi at the point of contact or near contact .as a single pillar form your aikido would be effective and within the peaceful edicts of the founder ,though the promoters might not want you back unless it appealed to the audience by the way it was done ,and didn't draw a foul for stalling and being defensive .it would be aikido and tai chi . the martial aspects of aikido are meant to bring an end to confrontation ,peacefully if possible ,but never think you should not resort to your utmost as an aikidoka if need be .there is enough film of mr ueshiba dropping sword hands on an opponent who has already been pinned (daito ryu style) ,and of his own admonition aikido encompasses all styles done in the spirit of aiki .that is non-resistantly ,using the opponents' strength against themselves rather than opposing their strength .every base technique has an inherent purpose , i.e. the purpose of a reverse punch is to down an opponent .if you land it as he comes forward and he goes down ,aikido .if you land it while he's retreating then it becomes the ikkyo for an entering throw ,aikido .