Bin Laden Killed to Coverup Evidence?

Well it is a fact that 5 people were killed during a gunfight in the heart of a Pakistani military stronghold far from the Afghanistan border, and that the world's most wanted outlaw had been linked to that location as far back as last August. Allegedly, the US Navy Seals "Team 6" killed Al-Qaeda top dog terrorist Osama Bin Laden during that gun battle.
Now though, the Iranian Fars News Agency is speculating on why he was killed, and whether or not he was killed at all.
Why he was killed:

TEHRAN (FNA)- The US has killed the Al-Qaeda leader, Osama Bin Laden, in a bid to prevent any possible leakage of intelligence and information about the US-Al-Qaeda joint terrorist operations, a senior Iranian legislator underscored on Monday.
-Fars News Agency

Is he dead though?:

TEHRAN (FNA)- Former Director of Pakistan's Military Intelligence Organization General Hamid Gol questioned the authenticity and reliability of the pictures showing the al-Qaeda Leader, Osama bin Laden, as dead, and said certain ambiguities have made him suspicious of the American account of bin Laden's death.
-Fars News Agency

No hard evidence to report, just speculations....kinda like the US government's case against Bin Laden.

And before all the "of course that's what Iran is saying" arguments start flying, here is a non-Arab take: