Is there a word, or tightly constructed phrase, that means prepared or pre-planned, but has a negative connotation?
The idea being that in some circumstances, it is better to be in the moment and improvising instead of forcing preconceived ideas.
An example use would be something like:
That guy can't let go of the ideas he had when he came in today. He's being totally
Update: While there have been many close and helpful suggestions, the key element that is still lacking is the concept of pre-existing plans. It's entirely possible for someone to be close-minded or stubborn while improvising new ideas of their own.
It may well be that a term like this doesn't exist, but the right term would not only mean resistant to new ideas from others, but necessarily include having pre-existing ideas as the cause.