Butler's record isn't impressive, with 2 losses and less than 50% KO victory. And I think Butlers also suffered a KO on his 2 losses so I don't think he is tougher than any opponent Inoue has met. Butler was floored by Zolani Tete on the eight-round when he was hit by two consecutive left uppercuts.[1] So it is highly likely that Butler will kiss the canvas if these two fighters meet in the boxing ring.
Speaking of Zolani Tete, he will have a fight against another British fighter, Jason Cunningham in an undercard of Joyce vs Hammer. The fight will be contested on 122 lbs, we all know that Casimero knock out Tete to get the WBO belt.
https://www.dazn.com/en-PH/news/boxing/jason-cunningham-vs-zolani-tete-date-fight-time-tv-channel-and-live-stream/1n7o9m3w9jgn31n7msgues080a
This fight didn't last as Zolani Tete blasted Cunningham from the beginning to score a sensational 4th round knock out.
https://www.youtube.com/watch?v=lH8JIyygP60
So he puts his name again on the map as could be the challenger for a world title. Cunningham is good no doubt about it winning the Commonwealth title, but Tete is on a different levels and hopefully he is ok because it seems he was knock out cold.