Yes, I would just use it as a topper or possibly in a meal a couple of times a week, to add some variety. I'd like to vary his diet a little bit, but probably wouldn't be too willing to completely change since we have had such great success with The Honest Kitchen. He was so sick for the first two years of his life, but THK literally cured him!
I also agree talking to a nutritionist is probably best...as long as I could find one that wasn't anti-raw.