Board Thread:False Info and Speculative Discussion/@comment-544940-20160309130458/@comment-11533671-20160326075547

Of course a chimera was needed & the explanation was both given and not difficult to work out. That's why the Doctors were harvesting & experimenting on chimeras. A chimera makes an ideal host for the Beast's ressurection because it can have 2 different sets of DNA.

The chimera teen was used to host both Sébastien's DNA and their own. Once Sébastien remembered himself he would do to Mason what Mason did to his twin...consume him. The Doctors were successful because they found the "type" of chimera they needed.