Obviously they showed that the [spoiler] worked, but didn't she show indicate that it might not have?

So, when iMark says to Devin at the end of s2e9, "she's still alive" before meeting Cobel, it shows that it's the correct iMark, but how were they sure that was going to work?

With Gemma, it was obviously shown that could have separate severance zones, so was there a chance that cabin would have produced an entirely different iMark?