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First, you are ignoring the fact that some oxygen will be introduced along with the DIL. The amount of course, will depend on how hypoxic the DIL is. Second, when it comes to live or dead situations, going from a safety margin from 90 second to 5+ minutes is a whole world of a diference.
I specifically said that I was ignoring any dil being added because it adds 4-5 lines to the equation and I'm not going to bother doing that since you shouldn't be adding dil back into the loop in this situation, you should be adding O2 because that is what you are consuming, and most importantly you should be using a dil that is matched to your ideal bottom mixes and I firmly believe in standard gases, i.e. 100ft=EAN32, 30/30, 35/25, etc. not air and certainly not 12/70. In either instance though the choice to ignore the addition of dil was to emphasize how important it is to actually understand how the rebreathers work and when you follow minloop volume, you aren't going to go hypoxic if you are not ascending.