So let's assume you were talking about any opponent and not just a sim opponent......
A double team is supposed to slow an opposing player. Maybe he'll shoot a lower percentage. Or shoot lures attempts. I'm sure there's a side affect somewhat where other player(s) may receive a very minor uptick in shooting percentage due to "more open jumpshot" or maybe even just fatigue created by the double team efforts.
However, in a game of RNG and all the many many factors that go into a game, distro changes, the +/-, the double team or non double team....... I don't think you can "see" specifics very easily, when it comes to doubling or not doubling, and how the box score would play out.
For example, if you play a team twice in one season on neutral floors, say in the CT and NT. And neither of you changed anything, except for one game you doubled a player and one game you didn't. You could end up with totally different results or you could end up with the same exact results. You could double team the player, and he might do BETTER that one particular game. Just based on what RNG gives you.
But in a vacuum, to my knowledge is supposed to help lower the FG% of the player that's doubled. I'm not certain on the effects it has on other players within that game tho