We are the worker bees. We don't "think". We don't interpret. We follow the instructions on the chart, as they are written. Gergiev has been conducting for over 25 years, he interprets what is written; but it was already written. As any orchestra is rehearsing, changes may be made. One may assume the arranger,who may very well also be the composer is sitting high in the balcony, listening and jotting changes as well. If I'm ever given verbal instruction in a piece, you bet I pencil it in, so I don't forget. Mostly, I like to make certain everyone else in my section makes note of the change as well, or, I'll expect myself sticking out like a sore thumb at rehearsal next week when we go over it again. I could only then hope Gergiev remembered giving these verbal instructions that only I acknowledged. Typically,a new chart "after lunch" with the changes incorporated is expected for all at hand.