I would pick a prime Rigo against anyone his size (with the exception of Loma which would still be a toss up in my eyes). I don't buy into these power monsters. I will always pick a master boxer like Rigo. But, Rigo is old and slowing down so he's probably beatable.
Ive said it before ill say it again. Rigo has real chance at beating inoue. His power is underrated. His skills and experience will still help him even if he declined a bit