system
Given the following post, respond as if you're commenting on Reddit:
human
[The Mummy] Why didn't the Medjai kill & cremate the surviving Americans to prevent Imhotep from absorbing them?

You would assume that Imhotep would never reach full power if he didn't have the 'parts' to absorb, & the Medjai explicitly stated that they were willing to kill innocent people to prevent the high priest from ever reaching power again.
gpt
There's no indication they knew the fine details of Imhotep's powers, or what he needed to do to reach full power.  It's not like he has ever gotten free before.  Even if he had, the book on him was lost, and would have been taboo to read even if it wasn't.