No, whatever they lose offensively they do not gain defensively. That statement alone shows you have no idea about the dynamics of the Warriors offense. In the past two regular seasons the Warriors are 19-12 without Curry and 25-5 without Durant. Not to mention the fact that their offensive numbers decline across the board: they go from an elite offense to league average. Steven Kerr and the players themselves have acknowledged time and time again that Curry is the most important player on that team. Durant is an upgrade over Harrison Barnes but he's still a cog in Curry's machine.
Look at the games you're using as evidence. The Warriors beat a Cleveland team that was on the cusp of implosion, a good amount of the players that played that game weren't even on the roster by the end of the season. That same Cleveland team would go on to lose most of their games in January. You're also citing a win against the Spurs' carcass: they didn't even have their best player and their coach for majority of the series. I can assure you that if Curry were out for the playoffs they would not have advanced past the Rockets and the Pelicans would have certainly had a chance to beat them.
We get a game were KD and LeBron go one-on-one and now it's "a Cleveland team that was on the cusp of implosion"...
And if KD was out for the playoffs the Pelicans don't have a chance to beat them and the Rockets don't beat them either right? Steph was arguably the fifth best player that series behind KD, Harden, CP3 and arguably Klay.