Overbeck's lawyer did not return repeated calls for comment by ABCNews.com.
Travena, who said that he too believes Cohen is being unfairly targeted in the Aisenberg case, told ABCNews.com that a complicated relationship between Cohen and Tony Peluso, the attorney for the sheriff's office, could be responsible.
"There no doubt about it that [Peluso and the investigators] have every intent of trying to nail Cohen," said Travena.
Peluso declined to be interviewed by ABCNews.com.
Peluso and Cohen went head-to-head following Aisenberg's disappearance, when Cohen defended the baby's parents on federal charges of lying to authorities about the case, in which the parents called 911 to report that their baby had been snatched from her crib.
The charges against the Aisenberg parents were dismissed after tapes recorded from bugged recorders in the family's home were ruled inaudible by a federal judge.
The Aisenberg's maintain they had nothing to do with their daughters disappearance, and told Cohen told the St. Petersburg Times that the family never owned a boat.
The couple remain suspects, according to authorities who told the Tampa Tribune in Nov. 2007 that "until we can clear them from the case, yes [the Aisenbergs are still suspects]."
That same judge also ruled the government to pay the Aisenberg's millions in legal fees, a judgment that Cohen believes has led Peluso to hold a grudge.
Even so, Travena remains skeptical of Overbeck's claims, conceding that prison informants aren't always reliable.
"We're talking about convicted felons," Travena told ABCNews.com. "I believe my clients accurately relayed this information but he kind of thought it was preposterous himself."
Cohen also told the St. Petersburg Times that both Overbeck and Byron contradicted themselves about whether Overbeck ever said Tranquillo sought help to dispose of the body. The paper also says that Byron admitted in his testimony to Cohen that he may have made some "assumptions" about what Overbeck was telling him.
In addition, the paper reported that Overbeck told Cohen that he had "mocked" Byron's suggestions that Cohen was somehow involved in the baby's disappearance.
The sheriff's office also admitted doubt in the trustworthiness of their informants.
"Lead information comes to HCSO from a variety of sources," the office said in a statement. "Obviously, some of our informants are more reliable and trustworthy than others.
"Nonetheless, regardless of the source, we are honor bound to lawfully investigate every viable lead, no matter whose feathers it might ultimately ruffle."