Ok as some of ya'll may know I switched Bailey to Chicken Soup and I see that she is eating very little of it

I don't know if I did the gradual thing to fast like I mixed his old food with the new for about 3 days (increasing the amounts appropriatly)then I went to CS all together was that too fast or maybe he just doesn't like it and its not for him......but get this he must like it because if I would go and pick some up with my hand and drop it on the floor he gobbles it up or if I feed it out of my hand he eats it but he won't eat it or he won't eat much at all if its just in he bowl with his other food Science Diet he would eat out of his bowl.....Any suggestions???