That was what I had stated. Capcom saw that the Cel-shaded style was popular, and tried to make it. It was like when Coca-cola came out. Others saw it was popular, and tried to make another product like it.
Look, Capcom wanted to make the Minish Cap out of something popular. They thought that Toon Link would be a good idea (He was praised in The Wind Waker for his cell-shadedness), and used it.