For days last August, police walked every square inch of the tiny town where missing teen Gabrielle Swainson was last known to be.But the 5-foot-deep hole where her body was found Thursday night was impossible to see.In the early days of the search, the FBI had set up its command post at a fire department less than two football fields away. Even cadaver dogs had walked past the grave hidden among trees about 40 yards from railroad tracks off U.S. 1 in Elgin.Finally, the man charged with Gabrielle’s kidnapping pointed it out to Richland County sheriff’s investigators.“The monster Freddie Grant...