I think what needs to be looked at here is the quality of the meat. Weruva is almost all chicken protein. It's an extremely low fat, low carb food. And the chicken that is used is boneless, skinless breast meat. All very digestible and a cat is able to utilize a significant portion of it to meet it's nutritional requirements.
On the other hand, "chicken" as defined by AAFCO includes skin, muscle meat, bone and connecting tissues. The quality food companies are using high quality "chicken", but you can be pretty sure it includes all of the above if they don't say otherwise (and that's not necessarily a bad thing). Some of those components do not have the same digestibility that pure breast meat has. So it's necessary to consume more calories to gain the same amount of nutrition.
In addition, Weruva has a very low fat content...on a dry matter basis Weruva is 9.3% while Wellness chicken is about 22%. Fat has more calories than protein (9 vs 4), so by having lower fat it naturally lowers the calories. Weruva does meet the AAFCO requirements for fat content, so not worries about that.
Other choices for chunky/shredded foods: Tiki Cat, Avoderm has some chucks and flakes, as does Blue Buffalo.
Wellness will be coming out with a line of chunky/flaky foods sometime in the near future. I had heard by June, but it's gone kind of quiet, so it may be postponed.
Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...