I'm curious about your reasoning, you view "rushers" as the cause of spawn flipping and you're saying that if they didn't rush the game would be better. I asked you a legitimate question, if you no longer wish to discuss this then so be it. Why wouldn't you just play FFA or another gamemode that you had enough friends for? Furthermore, bad spawns negate map control more so than rushers. I don't see the correlation your OP suggests, not directly as you say it does.
Wouldn't sending one person in to disrupt the spawn trap be logical, ideally a "rusher". Hell, just have the other 5 people put up some Danger Close tubes and send your guy in.