The short answer is that we will not know until Wallin has a few more quality fights. I suspect he is a good fighter. He is tall, well-schooled, a southpaw, and he showed both guts in taking the Fury fight and killer instinct. His weakness is that he lacks power, but he may fill out a bit over the next 2-3 years and that will help a bit. Let's see how he does against Kaufman, and then onto the winner of Browne-Davtaev.
No fluke Great gameplan & execution. Joey Gamache a solid coach. Wallin had no fear and wasn't intimidated like most of Fury's opponents. Which is extremely important. Fury knew after round 1 Wallin wasn't intimidated and it would be a tough night. No antics from Fury like normal. Went to Fury's body all night long to upset his rhythm. Fury was very flat and had an off night but Wallin still fought a great fight, he was positioning himself very well and Fury couldn't gain an edge over him boxing on the outside early. The cut came and Fury decided it was time to grind it out which Wallin couldn't handle. Wallin's experience is the main thing that let him down. Couldn't really hang with Fury at close range. Fury also came into that fight worried about his weight having dropped down fast towards the end of his camp which wasn't planned. John fell out with Fury's team after the first Wilder fight because they kept trying to slim him down and he wasn't keen on Ben's pure defensive approach. Tyson realized John knew what he was talking about after Wallin. When you're a 6'8" 270 pound man with a 12 round gas tank then you should use it to wear your opponents out. Why ring circle flicking out a jab for 12 rounds when you can make most of your opponents gas from mental and physical pressure. Watch all the historic ATG heavyweight fights. These guys are all blowing out of their butts after 6 rounds and leaning all over each trying to throw bombs. It's the ability to grind through that exhaustion and having the stamina and mental ability never to die. Fury has that ability where most of the division doesn't and he's naturally the biggest man. It's time Fury uses this advantage which he has shyed away from over the last 5 years because he hasn't had full confidence in his power but power has never been what has won him his fights. It doesn't mean you have to be full defense. Mayweather went from an aggressive defensive beast in his early days to a full defensive pot shotter. Fury will make the transition back to his aggressive old self now he has everything in his boxing game understood. He's going to do demolition jobs on these men.