Really! There's got to an explanation in there somewhere.
I don't think Chalmers is on-leave. How do they get him to comment on current cases (or why, he would have no knowledge)?
I think Chalmers is handling some things and Baker is handling others. It's unusal that Baker admits to all the conversations he's had with the detectives, etc on this case, and that he's in the "know". I think he'll regret that is on public record, because they'll come a time when he tries to distance himself from this investigation/persecution.
Could he be called as a witness by the defense?