Of course you can just pour real money into the game and get all 8~9* and hope for the best. The game isn't kind enough that an extreme quality difference is surmountable by strategy, unless extreme luck happens (as even 9* player may get a form of 4 and ruin the team).
But if you can say you know the game, you should win titles with lower quality players compared to your opponent. Of course you can't do it all the time, like rolling dice there is nothing for sure but I could say my chance to win is slightly bigger because the dice is biased towards my favour.