That "stuck on X-technique" was my actually my precise concern about the eventuality of the training model. One thing that got drummed into me about jiyu and randori in this way was the principle that -- if in doubt, connect somewhere and either irimi or tenkan -- if still in doubt -- repeat as needed.
We are tripping over each other in posting too fast...
Kind of like my randori sometimes!
I think that is a common thing for nikkyu ikkyu level...and perhaps in some cases beyond. It's one reason we sometimes make people stop and start over again if they start repeating waza. 10 attacks, 10 different waza...if you work on it, it develops, like anything else.