I think it's safe to say that IF one of the boys is actually involved in the disappearance/hiding of the body, etc., the attorney involvement has certainly hampered the investigation -- simply because they shut the kids up.
Not only attorneys would advise them to keep quiet. No one with normal intelligence would speak about how they got rid of someone's body. The reason that prisoners will often tell their associates about their crimes is that their intelligence is usually low, their impulsivity is high, and they socially identify with the other prisoners. Students are not prisoners.
Also, the consequences to the students would be much higher. The courts are unpredictable, and the judge might "throw the book" at them to score political points.
Let's imagine that some student, John Doe, gave LS some drugs before her death (if she is dead); but he was not heavily involved in drug trafficking, and he had no intention to do harm to her. Does anyone honestly believe that Doe should be placed in prison for 10-20 years, where he would be raped and abused, because he is different in background from the other prisoners?
However, JMO the students did not steal LS's body and improperly dispose of it somewhere.
The recent case in Laurel IN, in which Ison killed 5 people, seems to have been primarily motivated by money and drugs.
Could one of these drugs that the students (and apparently a large segment of the general public) is popping for recreation destroy the brain chemistry when taken in large quantities? Maybe Xanax is dangerous even at moderate dosage levels.
A middle-aged career criminal, Ison does not seem to have planned how to get away after the crime. He left evidence at his home. He didn't try to escape to another region. His father blamed his senseless behavior on drug addiction.
If Ison could shoot five people just to steal the drugs and cash, might not other low-level thugs abduct and kill someone just to steal their jewelry (for example)?
The body found near the recently demolished building might point to a murder perpetrated by someone involved in construction work. Perhaps some crime gang has cells that find employment in construction.