This is also my understanding. I know my IBD kitty developed an allergy to chicken after being fed chicken almost exclusively for a long period of time. Of course there is know way of knowing if feeding it exclusively for a long time is the cause of the allergy. My vet believes that it does contribute to allergies. Unfortunately he can't tolerate beef and I keep fish to a minimum so I have to feed things like rabbit and lamb which are the more expensive foods. Fortunately his allergy showed up in his ears rather than digestive issues.
That's interesting! And here I thought variety is always better so a cat doesn't develop allergies. I'd love to read that article when someone finds it!