You need to work on your math skills or buy a calculator. This statement says you've been doing nothing but getting very lucky so far.
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A more in-depth explanation for how your stats affect your battle results is available below:
The battle calculation is based on roughly 50% mafia power, 30% equipment power, and 20% kingpin power. Each one of those is computed separately. Within each segment, the attack of the attacker versus the defense of the defender is the most important factor. They do also allow for the attack of the defender versus the defense of the attacker to have a lesser influence as well. Within each segment, the algorithm looks at a margin of victory in percentage terms. Then each weighted segment is added according to the above to determine the final outcome.
Regarding the relative importance of attacker attack versus defender defense versus defender attack versus attacker defense: There is not a fixed percentage of each segment of the calculation. The bigger the discrepancy between attacker attack and defender defense the less the defender attack and attacker defense matters. In other words, if Player 1 attacks Player 2 and Player 1's attack is significantly larger than Player 2's defense, then Player 2's attack and Player 1's defense will be largely irrelevant. On the other hand, if Player 1's attack is exactly evenly matched with Player 2's defense, then Player 2's attack versus Player 1's defense makes up half of that segment’s calculation.
Currently, the attacker defense and defender attack stats aren’t shown in the battle results. They are considering how they can display this information to players better in the future, however because attacker attack versus defender defense is the most important factor those are the stats they chose to display.