well some players use their tokens to build faster.. when i was level 4,i had to play in my league vs team which had stadium with 91 000 seats and i have 7 000.. sadly stadium doesnt make ur players better
so maybe thats why you see some players with bigger stadiums,they are using tokens as July Fourth already said.
Its very funny because most players will soon realise its just a waste of tokens to speed up construction, Tokens are best invested into the team.