The chances of that is close to zero. I would probably even bet on it not happening.
DC property is such a lucrative thing that Sony is nowhere near the level of a conversation where they can hope to acquire it. If DC properties are for sale (I presume we are talking about gaming), it will be a bloodbath between big tech giants. And if WB is for sale, it will be another bloodbath ((though WB had a big debt, so it might discourage some companies) between another set of tech giants. I wonder if EA would want to merge with WB-Discovery (lol)
Defensive purchase is when you acquire something that you originally did not plan to acquire but you had no other choice but to win the bidding war there. For the public companies (and we are talking about publishers) you cannot purchase anything defensively if there is somebody else who offers a bigger price.
People really overestimate the reach that Sony has.