This doesn't have to mean "ripping" there is also a thing such as "tribute". If the makers of the Naruto anime were great fans or inspired by these other anime's or shows. They could but a tribute in it to the show. For all we know, they gave credit for it in the end credits, but as far as I know 99,99% of the people watching the dubbed Naruto, cannot read Japanese. So we will never know. I do, however, not believe that they ripped anything from another show.