Codenomicon, the company who actually named the flaw, didn't find the bug via the source code. They were building a security product and when testing that product against their own servers exposed the flaw. Open Source was not a factor in this discovery.
Google HAD discovered the flaw via the source code, exactly two days earlier.
In this case, the bug was 0.267379679% more discoverable due to being open source versus being closed.
it would have been way worse, because it would have been less discoverable in a closed source software by someone somewhere
Devil's Advocate...
Codenomicon, the company who actually named the flaw, didn't find the bug via the source code. They were building a security product and when testing that product against their own servers exposed the flaw. Open Source was not a factor in this discovery.
Google HAD discovered the flaw via the source code, exactly two days earlier.
In this case, the bug was 0.267379679% more discoverable due to being open source versus being closed.