Not quite Marc
The senior taught in the role of uke and that was primarily in weapons based kata - not necessarily in jujutsu techniques. It would be a mistake to thing that these seniors were the level of kyu grades or early dan.
That said - I know in systems which are kata based the role and expectations of uke are taught from the beginning. Learning that helps you to understand the techniques from tori's point of view also. In Shodokan for example it is expected that you should be able to effectively teach techniques required two kyu levels below your own.
I do agree with your point though - with the proviso is that they teacher and others should be all on the same page.