Yes, the newest stupid twist, the coaches returning to the game, explains all the other stupididty we have seen thus far.
By adding 4 players to the game, production needed a way to reduce the numbers at the start: Eliminating one after the first competition did that. One can also say that throwing out Willie worked perfectly so I wonder if his DR sessions served to stoke his anger instead of cooling him down.
Then, by having a coach "save" a player each week, you gave them an opportunity to gain more trust. Malin and Janelle can go to Ian and Ashley saying: "I saved you once, you owe me." It can't hurt to have that trust since the game is all about trust. Malin was never going to be able to save Ian all the way to the end because that Coach's competition was only meant to last 3 weeks.
Next the trade offer was really a way for a coach to get rid of one player that didn't trust them. Maybe the new coach would be able to get that player in line.
The goal of these twists is obvious: Find a way for the newbies to work with the Coaches when they become players so that a coach will eventually wind up in the Finals.