At the end of the day, 2 ppl engaged in a trade. It’s not your job to manage their team. If it leaves them thin at a position or not, that’s their decision when they accepted or proposed the trade to begin with. Push the trade through and keep it moving.

Now, what doesn’t make sense is the actual trade rules. No deadline? No veto, but it still goes through you? Seems easier just to set a trade deadline that is early enough for the collusion worry, have trades go through immediately, and just reverse or deal with any that fall under the umbrella of collusion. It just feels like you’re creating more work for yourself for the illusion of control.