I would say if the Simon transfer rumours are right, it's plain economics.
It's the start of November not the start of January, plenty of time to find a replacement, who knows JK may have already someone earmarked?
Simon signed a 1 year extension that runs out at the end of the upcoming season, if we were not to 'cash in' on him now he would leave for nothing at the end of his contract.
Good player but he is replaceable and has been mentioned, his contract plus a bit of coin go elsewhere, no brainer!