I feel that Samsung is probably stressed through Sadie leaving so abruptly. One of my bengals escaped last year and was hit by a car. The other bengal cat I have, not quite 12 months became depressed, didnt play much and ate less for a couple of weeks. I gave her lots of attention, cuddles and reassurance. After all the cat we lost was her 'best friend', sleeping companion, playmate and everything. My oldest cat, who is not a pedigree also went off her food a bit. They got back to normal ok. In your case, Id say to give him something really nice that he likes. My girls love turkey
Keep an eye on him, and if it goes on ask the vet.
Julie