2016 Newbury Award Winner

Last Stop on Market Street - Matt de la Peña, Christian Robinson

I'm a bit confused - I agree that Last Stop on Market Street is a good book that deserves to be rewarded,  but how did a picture book written with a complexity appropriate to the lower elementary grades win the award for the most distinguished work of children's literature in 2016? Good book, yes.  Deserves to be shared. Yes.  The best work of literature in 2016?  Not in my book.