With those flames, it could be a yellowbelly, but the belly is not quite right to me. Not all yellowbellies display all the characteristics in a classic way, but there needs to be a hint of them.
Here is a proven ivory producing CH yellowbelly male I used to have that does not have a textbook belly. Yet, you can see a suggestion of the pixelation trying to come out.
There were those way back then that doubted that mine was a yellowbelly until he produced an ivory for me, so, if you think you see it, breed him and see what happens.