Here is the thing; every time a fighter loses horribly, I never think they are going to be the same. Maybe they won't be that affected, but at least somewhat.
Pre-Usman Colby would absolutely destroy Chiesa. Now, he would probably still win, but it's more of a delicate matter. Thankfully for him, he did not take that much damage in his previous fights.
Some people have said that Nate Diaz should fight Poirier. That is another thing; Pre-Masvidal Diaz would defeat Poirier in a decent fight, but I think Post-Masvidal Diaz's health would be at risk fighting against Poirier.