I don’t believe that LTC Lakin is being represented by his brother. His civilian legal counsel will not present a defense that has anything to do with Obama or his eligibility. The Military Judge has ruled against that and Lakin’s civilian counsel has said that he agrees with her decision and believes it to be correct as a matter of law and of fact.
LTC Lakin’s brother may be a part of the problem.
To use your words, the brother certainly may be part of the "problem".
As a former prosecutor in Hawaii he may have relevant insights as to the birth documentation practises employed by that state, and particularly with reference to specific instances.
One could also expect he has had an ongoing flow of information from friends and prior colleagues.