Having spare implants is a good idea, especially considering how difficult it appears to be to source truly big ones. Makes me wonder if some of the bigger ladies might in some environments use bras enforced with something like aramid fibre fabric. Beshine and other models have done shoots in, for example, the forest, so in that setting its not out of the question that an errant stick might poke in the wrong place.
Here is an older picture of Beshine - probably one familiar to most, but I find it adorable. Beshine is slightly lifting her breast and showing off the immense side view her implants give her. She looks so satisfied with what she has achieved. ☺️