Libby took after her dad. Tall, wide-boned, wide-faces, blond-reddish hair. From the few photos it would appear that he is very tall, a big man, he would definitely have problem walking down that bridge. He looks nothing like BG, not even close, and - JMO - like all the parents of the Delphi victims, he is profoundly grieving.
Plus, no doubt, LE has checked alibis of both families.
I don’t know what “empath” is supposed to mean, but in my view, “empathy” means “compassion”. How can a compassionate person ask if they checked his DNA? Be sure, checked, and probably, again. Kelsi said that she had been checked three times.
He probably feels bad that he did not arrive sooner that day, and always will, why accuse him of something that is highly, highly unlikely?