He may have fired some people? Do you know that he did or is that just a theory? If it's a theory, we can throw it around, just like we've done with every theory postulated here. But if you know that for a fact, that'd be some information I'm sure law enforcement would welcome.
Without anyone on this board personally knowing anyone at Eurosport (or formerly at Eurosport), how can we dig there? A company's employment records are not public. Our digging is kinda limited to public records and what we can find on the Internet.
Supposing he DID fire someone and that someone came by the house, looking for Raven. The leap to that person murdering Janet is a mighty, mighty big one, dontcha think? If the motive for the murder was revenge against Raven, wouldn't the murderer want Raven to know who did it? Otherwise, what would be the point?