Losses happen. And a 1st round KO doesn't really mean much. It wasn't like he was dominated for the whole fight. A blemish on your record yes but not something that screams out "exposed"
Linares has a horribly bad chin. Has a reputation for it. Anyways Rios would KO him ala Acosta. Linares is talented but hasn't really progressed. Rios would give him a bad beating IMO
Does he really have a bad chin? Are you basing it on that one fight where it landed perfectly early in the fight. I heard he got dropped in that one training camp and was having issues making weight.
Linares doesn't have the defensive tools or the durability to last with Rios. My guess is that Rios would wear him down and finish him off in the middle rounds.
After watching Linares last performance I'd say Rios within 5. Linares seemed unsure of what to do in the ring. He needs to find his ring identity and get more confidence. Don't see it happening though even with Roach.