There is no Porthos. Archer has Travis to take for walkies now
I thought the shift might suit him better and actually give him something more to do, rather than just be the token black guy. He would be an advisor to Archer, providing his in-depth knowledge of space and aliens he encountered on his parents freighter, whilst also able to gage the mood of the crew and keep Archer in the loop about matters he would normally never hear about. He would also be an officer-in-training, someone Archer could take under his wing and help guide.