There has been a lot of talk in some of the other threads about the assumption that no one would risk their own freedom to hide Gabriel for EJ for this long and therefore he must be dead. I don't buy that. I believe that whoever has Gabriel is hiding him because they strongly believe they are doing the best thing for him. They were probably fed a bunch of lies by EJ to get them to believe that Gabe was in danger. I believe TPS may have helped EJ find these people, or EJ may have received help from a shelter. There are documented cases of underground organizations who are willing to risk everything because of what they believe in. They are fanatics. That is why Gabriel is still missing 4 mos. later. They are not going to turn him in. Someone will have to find him.
I've only seen a little bit of talk that no one would risk their freedom

I agree about the couple.
People who follow Gabe's case closely and especially those who have seen the depth of irrational fanaticism among, let's just say those who were attacking Gabe's FB, understand how that kind of skewed thinking could lead someone or some couple to cross the line into doing the unthinkable - stealing and keeping a baby.
If you review the rhetoric of these people, you also see that criminal acts are just fine with them - they not only put out the message that felonies are fine but that, in their warped minds, most people would commit them. That's scary. But if you examine this almost cult-like criminal mentality, you can see how this type of person would indeed assist in kidnapping a baby. The safety, well-being, and best interests of that baby are meaningless to them. Their irrational beliefs, and their own self-interests are what's paramount to them.
Yes, people like that would most definitely assist in kidnapping a baby, whether it's keeping the baby themself, or assisting in the arrangements to do - withholding information on his whereabouts that could lead to his rescue, providing money, clothing, food, housing, etc, to the baby and/or whatever person or couple is currently holding him.
So far as an underground shelter goes, I believe you're referring to domestic violence shelters. I haven't seen any indication that Elizabeth sought help from any domestic violence shelter, except that one reference from Tammi. My understanding is that Elizabeth sought help from other types of women's organizations and shelters, and that that was only to get herself and Gabe set up to live in San Antonio - help with getting an apartment, job, food, etc.
If Elizabeth did seek help from a domestic violence shelter, particularly one of the underground ones, they'd have turned her down flat. Elizabeth was the abuser, not the abused, and she would have no way of corroborating a claim that anyone was abusing her or Gabe.
DVSs are generally poor organizations, geared toward helping women in imminent danger of physical harm. They have screening processes to ensure that they're putting what little money they have into helping the women with real, pressing needs. The underground shelters require proof in the way of court documents to show the woman has tried traditional means to get protection, and that the courts were not responsive.
Elizabeth had nothing, because Elizabeth was not abused by anyone. The only court records and police reports, as well as numerous witness reports, show clearly that she was the abuser, and that she was abusing both Logan and Gabe. No DVS will take in an abuser.
I make no claim to be an expert on DV, but I did volunteer work in it for years.