The point is about team expectations, not in pitcher comparisons, either by age or record.
When the Yankees got Randy Johnson, it was assumed they would go to the World Series. The expectations are the same by many of the Mets because of the addition of Johan Santana.
The point is the Yankees did not win with Johnson because they had other flaws. Likewise, we can’t assume the Mets will win just because they got Santana.
Both were considered the missing piece to put their team over the top. Their age and what league they are irrelevant to the point.