re: Francis Scott Key Bridge in Baltimore has collapsed - container ship wrecked into it

Looking at the bridge I am still a little unsure why the furthest right span failed.

To me it looked like with the left pier out, the right span turned into a simple span supported on both sides (one side the remaining pier, and the other the approach).

My guess is the furthest right section of the bridge (where the bridge starts) was never meant to support that kind of shear load when the central span fell, but I do buildings and not bridges.

Any bridge structural guys out there that can help me out?