How are low level player ranking high on the battle rankings

I figure people with low level ranking first is due to them having a second account.  Are they using aa teams or a+ teams to beat newbies. And how are they battling so much

Some of them are doing exactly that. But the rest are just very savvy. See, defeating a player that has at least 4000 more honor than you will earn you 25 honor. Also, it is customary to leave only a low level weak monster as defense form when you quit the game. So if a low level player finds a quitter that is significantly higher level than him, and has at least 4000 more honor, the low level can easily win with just one maxed level A+ monster. The lowest bp A+ monster being 10, that's at least 8 attacks per refill. You don't even need to have a second account to give you good cards.