Poole

I don't really think that Mr. Rochester trusts Grace Poole, rather, I think that he has an obligation to take care of her. I mean, think back to when Mason is leaving, Mason says, "'Let her (Grace) be taken care of: let her be treated as tenderly as may be; let her--' He stopped and burst into tears. 'I (Rochester) do my best; and have done it, and will do it.'" I believe that Mason knew Grace, or maybe even had something to do with the way that Grace is now. If that's the case, Rochester is doing a favor for Mason, and that is why Mason is so loyal to Rochester. Hopefully everything will be answered soon.