I think Sanchez can pull it off, knowing he has the determination and youth to pull off an upset.
If upset will happen on this match, the boxing career of Casimero will now be questionable. A lot of his supporters here are rooting for him as they are always bringing up the topic of facing with Inoue. And if upset will indeed be the results, would be hard for the Casimero's team to find a good fight, so he should really has the motivation to win this no matter what.
We can only conclude if he loses against a rated boxer. In the current situation, we can't say that because Casimero hasn't lost since he moved up to the current division. His wins might not impress us, but if he's given a chance to fight a champion, we might see him upset a favorite boxer like Inoue.
The discussion now is that Inoue is moving up, and Casimero might not have a chance to fight him. Despite that, many still want a Casimero vs. Inoue fight to happen. I think this isn't about whether he deserves it or not because, for sure, this fight will generate money. After all, boxing's primary purpose is business.
This is what Casimero's supporters are aiming long time ago, to face Inoue. However, the circumstances are slippery for Casimero and it seems that Inoue is already far from Casimero's reach. He has a lot of work to do to catch up on Inoue's status.