He isn't saying Rodriguez is on the same level as Rios. If Pacquiao is a level higher than Cotto ( which he is) then Rios would have to be a level higher than Rodriguez for the difference in levels to remain the same throughout both sets of fights.
Simplifying things further.
8-3 ( Cotto v Rodriguez)
10-5. ( Pacquiao v Rios)
Simplifying things further.
8-3 ( Cotto v Rodriguez)
10-5. ( Pacquiao v Rios)

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