That's what I'm thinking. Logically, the B8 stuff can hide; when they rebuilt Indigo after Graduation Day, it was checked by Roy, STAR Labs, and I'm betting some of the League, too. We have plausible deniability that it can hide itself 100%, just like Kon's mental trigger did.
Plus, it lets us skate a bit more around Stacy mind-raping us all, with it being a more minor alteration to our memories than a major one. More of a shifting than full-blown mindscaping. Which makes it easier for her to avoid being caught. We could even go as far as to say that B8 and Indigo were from the same point in time, which is why B8 tried to use Indigo as the slave-host.
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Plus, it lets us skate a bit more around Stacy mind-raping us all, with it being a more minor alteration to our memories than a major one. More of a shifting than full-blown mindscaping. Which makes it easier for her to avoid being caught. We could even go as far as to say that B8 and Indigo were from the same point in time, which is why B8 tried to use Indigo as the slave-host.