Because his competition started getting stiffer as he got older?
Providing you accept the premise that fighters tend to decline with age past a certain point, then you can interpret that correlation in a number of different ways and make a decent case for any of them, but sadly, indisputably prove none.
since 2014 his competition has been about 75% populated by stiffer (ie. top, not deader) opposition. Thats why hes struggled. Its title boxing not a dance off.
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