There's plenty of reasons to dismiss Cardinal Health (CAH). Its recent performance fails to inspire confidence. But the company that saw weak growth isn't the same Cardinal as the one today. This all goes back to the debate over conglomerates, says William Blair analyst John Kreger. "On one hand, being a conglomerate diversifies risk. But then again, with conglomerates you do a lot of things, but nothing really well." Old Cardinal Health was a