I dont think we were ever going to offer Sadio the same pay level as Mo, which is why his sale became a given as once Mo signed, you'd definitely have Sadio being disappointed with his contract offer. The other difference was the fact that Mo made it clear he would be here atleast for another year, regardless of the outcome, making it a decision between either extending him or releasing him next summer. Selling him was never genuinely considered.
Absolutely love Sadio and he's a bonafide legend, but given a choice between the two, I'd want to keep Mo too.