Re: Moriteru Ueshiba v Christian Tissier
In my view aikido is a very "broad church" - and I personally like top level practitioners to be different - to give us something different to choose from - and indeed to aspire to. I am personally not so keen on senior students of teachers being carbon copies of their teachers. I want to see them express principles, but according to their own characters, bodies, shapes and sizes.
Have you practiced with both of these teachers? If not, I would suggest you reserve some judgement until you have done so.
Investigate - let us know your further conculsions.