How did early bloggers report that it was initially Mohamed Atta?
No one reported anything about Atta (in that timeframe). You're confused.
The 9/11/2000 pilot, Bukhari, and his brother shared an apartment with the 9/11 hi-jackers aparently. CNN's 9/12/01 article (linked above in this thread) shows that Bukhari's ID was then used to RENT THE CAR for one of the 9/11/01 hi-jackers.