I agree. A pitcher this young needs to stay on the developmental path that increases his innings by 30 or 40 per year. Jumping back and forth is dangerous IMO. Cueto threw 138 innings in 2006 and jumped to 161 or so in 2007. These Winter innings tacked on has Cueto near 200 and seems a risky jump IMO.
I don't think the back and forth game or the big innings jumps should happen before age 23 and ideally age 25.