Had to laugh reading about someone wanting to watch the Pop Warner crowd, certainly a minority on this Board! I am about 99% sure you will need another ticket beside your admission to Wide World of Sports.
Also, if you plan to take the Disney bus system there, we found out the hard way that you need to take the resort bus to Disney-MGM Studios and transfer to the Wide World of Sports bus there. Do not believe anyone who tells you to go to Downtown Disney. Several Cast Members at Boardwalk told my husband he could catch the bus at DTD, and by the time he got there and found out they were wrong, and then got back to our resort, the baseball game he wanted to watch was 1/2 over.