Sometimes you can take circuitous paths in explaining something, confusing everyone involved. So I'll just use two numbers to illustrate why the Indians have such a good record since the All-Star Break:
Runs Scored: 353 (3rd in AL)
Runs Allowed: 257 (2nd in AL)
In the game of baseball, there are two objects; to score runs and prevent the other team from scoring runs. Everything subdivides from there. When you're that good in both categories, you're going to win a lot of games. Of course, explaining exactly how those runs are scored or prevented is a difficult task, but it's easy to look at the end result and make a conclusion.