Recently, I scimmed through the article for the Cerberus Centurion and was interested by the fact that apparently, Cerberus grew in size and strength but no one seems to know how they've done it. After leaving the article for a few minutes, a theory about it unexpectedly went off in my head: Is it plausible that Cerberus is making clones?
During the events of ME2, EDI could have possibly sent the data on Grunt's tank to the Illusive Man and now that he likely has Collector or Reaper technology in his possession, he could use it to develop hundreds, or possibly thousands of bloodthirsty soldiers and just keeps them under control with mind-control chips like the one Miranda wanted to give Shepard.
In fact, what if these clones were created with a bit of genetic material from Shepard? It's not like Cerberus didn't have unlimited access to his body for two years.
Anyway, it was just a little theory that popped into my head that I couldn't help but share.