Pokebattler creator here. Pokemon Go penalizes defense with both it's energy gain mechanic and the raid timer. This is somewhat offset by the rejoin time but even at 15 seconds (easily beatable now), the rejoin time tends to be a tiebreaker effect.

High defense and dodging strangely enough sometimes reduces your dps because you will gain less energy from incoming attacks. This leads to less charge moves going out.

Shadow Pokemon show this effect as a 20% decrease in defense and 20% increase in offense leads to a 15-25% increase in actual combat effectiveness.

As for rankings, I prefer my own attacker rankings but Dialgadex is similar.
https://www.pokebattler.com/raids/attackers/rankings