Having known Shibata Sensei for many a year I can state that anybody looking for non compliant , serious Aikido training would be accommodated by Shibata Sensei.Relly nice man and a powerful aikidoka. Cheers, Joe.
I believe there as also zazen and iaido classes offered in addition to the many aikido classes. Also a rarity, lunch hour training. I don't train there anymore but 'rigorous' would be an understatement.
To follow up with the OP's query... I've known many aikidoka who went to BJJ or originally came from TKD and many other arts. They do tend to keep coming back to aikido - some take longer than others.