Who is John McNab in the book Maniac McGee?

I love this book~! Just finished it the other day!!  I am probably the best one to ask because my memory is still fresh!!  Well, John McNab is the baseball player in the book Mniac Magee.  He strikes out everybody until Manic shows up and hits these throws and makes them HOMERUNS!! He also hits this ball, tthat is  frog!  It is a frog that McNab got from he woods!  McNab now hates him, so him and his crew, The Cobra's go and try to find Maniac and hurt him and beat him up!  Then, Maniac is sleeping inthis abandend house in the woods, and McNab sent his little brothers to lure Maniac in so that he can beat him up.  Then, Maniac gets lured in, and McNab is nice to him!  So, Maniac walks into his house to sleep there for the night, and there is poop, cockroaches, peanut butter on the floor, and much more gross stuff in his ouse.  Then, McNab;s dad alks in and starts drinking beer and slamming stuff around and then thge Cobrrss wal in and they start drinking keep in mind they are 12 years old, then his little brothers stary drinking beer keep in mind that they are 6 or 7.  That is who McNab is in the book Maniac Magee!!!!!!!!  You are welcome~~