I think we heard more details than just that. Cain just set career bests in games played, bb%, k%, and OBP. All those things would be very rare if there was any decline in athleticism or reflexes. It was his 3rd-best season for sb's and 2nd-best for sb/cs ratio (26:2), the best being a 10:0 ratio in a partial season. They said they studied video evidence and saw that his speed in CF was as good as ever. Simply put, he's still in his physical prime despite his age, and he's a lot more athletic than most players are at 27. So while it is true that they usually avoid 30-somethings on big contracts, they clearly did their homework. There was a ton of oversimplification happening in Cain debates, and it was pretty frustrating trying to explain why that was a good move even at his age, and even if they don't follow it up with other, more impulsive "win-now" moves. At this point, it's nice to let his performance speak for itself. ETA: Not to mention all the player comps like Cameron and Victorino, who did pretty well until their mid-30's.