Yes, he has a shot, but Casimero will hit him and he will become defensive again, that could make the fight boring for us.
I don't think that this fight will go boring, that superb power punch and accuracy of Rigondeaux will be his weapon while Casimero has the speed and power in my opinion this is definitely a very exciting match I could not see the full depth of what may happen means it is unpredictable.
You have to check the record of Rigo, when he steps up and fights high caliber boxers, it's usually more of defense skills and UD win, against Nonito and Joseph Agbeko, and when he fought Loma he quit. His last 3 fights,
Solis with a record of 30-5-1 = SD
Ceja 32-3 = TKO
Delgado 16-8 = KO
So that's level B fighter, now he is fighting a champion, at his prime, had a great chin, so I doubt that he can knock out Casimero with his "power". He is old at 40 and when fighters are ageing, the first thing that will go is your power and speed. Could be exciting in the first couple of rounds, until Casimero takes over or chin tested him and then Casimero will go back to his defensive style, which will make this fight a snoozer.