Alright, first off Jake O'Brian was undefeated when Arlovski beat him and was seen as a can't miss prospect many people were actually picking him to beat AA, Werdum was coming in form Pride as a world class submission grappler who had recently beaten Overeem and Aleks E, Rothwell was considered a top 10 HW till Arlovski knocked him of the list and Big Country was the IFL champ which did carry some weight and was seen as a respectable fighter who was probably top 15 at the time.
Now as for the he'll get knocked out again, come on AA has never been knocked out by any scrubs his jaw may not be rock solid but its written off much to easily.
This. Arlovski has all the tools necessary to be a top 5 HW for a long time, if he got his mind straight.
The dude's an AMAZING striker, he's got great grappling (he was a Sambo champion) and he's a physical specimen. It's just that he gets lost in his own mind and can never seem to focus. If he had a prime CroCop's focus or Nog's current focus, he would be nearly unbeatable IMO.
Now that he's at a real training camp, maybe we'll see him do amazingly again.