Very nicely said - what we do in aikido is not exclusive to it!!! I think the philosophy of aikido is more highly specialised than other arts - for example, in aikido we almost exclusively pay attention to a particular way of doing throws/locks, with generally(and note, generally) little attention paid to strikes. Basically, aikido takes this particular "Chin Na"-ish concept further than any other martial art.
In the book "Tai Chi Chin Na", Dr Yang, Jwing-Ming describes aikido in the glossary as(and I paraphrase), 'A system with the same principles as Tai Chi'). So, it can be said that aikidoka sepcialise in performing defense-orientated throws and locks, while remaining true to Tohei's principals - or something along those lines.
A direct example from my experience - my Tai Chi teacher, while showing me the applications for a routine, demonstrated a sokumen-iriminage on me.
Er, don't flame me too badly,