Your correct that the AR does good for defense as well, however this combo will still be using upper attack whether you mean it to or not. If you want a balance combo, use 10bBistool or Dranzer V2 (or compacts).
Dunno, wasn't thinkning too much about the whole beyblade, just left = no upper attack. It's too early for this. >.> Don't think it'd be too much of a problem. You might be going up against other left spins anyways......pluss you could use Gattyaki.