Well you know, just from a biological perspective, just because "so many" sperm arrive at the egg, doesn't mean it'll be easy for the one lucky sperm to inseminate it. It's gotta work its way through its defense systems. In the same way, those hyper-sperm probably needed to break through the cage. It might not be more symbolic than that. It may have simply been DMT's quirky way of showing how that kind of process works. I mean, after all, think about it. It's only been fairly recently in this bout of human history where we've understood how that process works. Had someone smoked DMT or taken ayahuasca 200 years ago (and yes I know you couldn't smoke DMT 200 years ago

) , it could have led to a groundbreaking discovery on the mechanics on conception. DMT has its way of sometimes showing you the way things go, how they're ideally supposed to be, how you should live your life, etc...Dreams are also more reactive to your (semi)conscious suggestions while DMT isn't so much so, and as a result, I'm not sure how accurate applying dream interpretation to a DMT experience would be.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb