I've checked Otto Wallins boxing skills and watch some of his fights and unless Tyson is on a sloppy condition, I don't think he'll have a chance to Beat Tyson, he is not on a class like Ruiz to beat a fighter like Tyson, and I don't think it's a good tune fight for the coming Wilder match.
Before the Antony Joshua fight that Andy Ruiz won to become the heavy weight champion few gave him a chance or class but not he has a class how things changes. Wallins is not bad and Ruiz is not exceptionally good, you don't just underrate an opponent in boxing it would be a time bomb waiting to explode