I wouldnt say that he was finished, he is only 30 ffs!
People have won titles in their 40's before. This fight will tell us whether he still has the minerals to compete with the best in the division though I guess.
I said finished at the very top level. The percentages are so small and crucial there that being out of the ring for a couple of years sniffing gear and piling on stones will have an effect.
As I say it is more a gut feeling than anything else