The video says nothing about Gowdy doing anything but trying to get to the bottom of things. He admits he relied on briefings, and then changed his view when he obtained the actual documents, and didn't continue to rely on briefings again.

He tried to get to the bottom of who leaked the DNC emails, but there was no evidence at that time to see.

so (if you possible can), without the acrimonious tone and profanity, help me understand what he specifically did or didn't do. I'd truly like to know.

You mean what.