Chris Walker was a former a Murkoff employee. Until he himself was put in the project becoming a variant himself.
But when Walrider broke, he also did, he also remembered that the Walrider was not to escape or have a host.
Following his proticalls that he had before being thrown in with the other experiments.
He would find people, inmates, variants, or employees all would meet the same fate of being killed before walrider could use them to escape, and wreck havoc. However he himself was also mentally il before he was thrown in.
So that would explain his speach and his "trophy" room with heads.