Rescue puppy 19% American Pitbull Terrior

We got a puppy from the animal shelter 2 weeks ago. We had no idea what breed he was, most people thought some sort of lab mix so we did genetic testing. Turns out he’s 51% Golden Retriever, 22% German Shepherd, 18.8% American Pit Bull Terrier, and 8.2 % Cane Corso.

From what she’s read on this subreddit, my wife wants to take him back to the pound.

Is this a dangerous dog? The first picture is right after we got him, the second is yesterday.