No - it wouldn't explain Scott Carson.
It would explain signing a very decent non-HGP keeper, but Scott Carson isn't one of those.
However, Tim Krul not signing another contract would explain Scott Carson fully.
:shrug:
Had a bad time at his last big club Valencia, so may not be that keen to get back into a similar situation. Enjoying life at the albion.
File under 'unlikely speculation'.
...unless we suddenly sign a decent non-HGP keeper.