On the question of whether the defense team could be sued for discussing others as potential perps in this case, usually I'd agree that there'd be no legal recourse against a defense team. There's "not supposed to be." But there's also "not supposed to be" an SODDI advanced that's ridiculously speculative. And there's "not supposed to be" a situation where graphic photos of murdered children are leaked when there's a gag order in place. There ideally wouldn't be "crowdsourcing" to hire experts while a D spends thousands of legal hours pursuing the aforementioned SODDI.
Agreed the D didn't reveal anything to the public in this very high-profile case that wasn't already public knowledge, but that begs the question of why they bothered to "reveal" anything at all, as there was no revelation. So that means these people's names were dragged through the mud in a highly public fashion for absolutely no reason whatsoever.
As we see from this case, the legal world is clearly full of very creative thinkers. So I wouldn't rule out the idea of some lawyer or related organization getting very creative at the end of this process and this time directing that creativity into an examination of counsel. I'm not a lawyer, though. But there's no disputing that lawyers can get very, very creative when it suits their purposes.