Hello Peter,
I think the only issue here would concern the extent to which those outside Japan who are practicing Japanese martial arts believe that they need to adapt Japanese practice to fulfill perceived needs in their own dojos. The use of the term sempai and kohai is an example. In my experience here, the use of the term is highly specific and restricted, but in some dojos overseas it seems to be a title just short of sensei. There are also invented title like 研修生 (kenshuusei), that I have never encountered here.
Best wishes,
PAG
Peter Goldsbury,
Forum Administrator,
Hiroshima, Japan