I think Galen's contributions to the Norjak investigation are significant. Further, they are described extensively in my book for those who want a closer examination.
But here's a synopsis: his investigation of Tina, the convent, Dr. E-T, the Dormuth's, and Tina's ex. He found Tina when no one else could. Further, Galen has had numerous interviews with Alice, Flo, Bill, and even Anderson. His research on Wolfie is invaluable, even though I don't think Gossett is Cooper. In addition, Galen's findings on the letters is singular. He has had extensive email exchanges with both Eng and Carr, plus on site visits to the Seattle Division. He successfully sued the FBI and got access to Norjak evidence. The depth and breath of his knowledge on Norjak is not surpassed.
He even uncovered the cattle mutilations on the Fazio ranch. He's spent 50K on his investigations. Who else can match that?
As for fabrication of evidence or findings, I am not aware of any. Georger says he has been "nailed" numerous times. Please elucidate.
Does he have faults? Yup. He can act like a jerk at times, and Blevins drives him nuts. So what? To me, Galen's family, and he has never lied to me.