Also, keep in mind this is the very first time a working nautiloid is exposed in the Realms. The Ilithid at this point have long lost the technology to create more vessels, and those remaining are not to be risked in such aggressive operations because Githyanki can track them down easily. The Ilithid that insters us the tadpole is in no way part of typical Elder Brain, a corrupted one might, but in any case it serves the Absolute.
