It's a valid question AB. Being certain he's a tool is one thing. Being certain he's the tool for the job is another.
I don't think he'll be back anyway now that it's been confirmed that the FAI never even considered making his Da manager thus enabling Stephen to run home to tell Mama if he didn't get picked.
If the remark about having til next September to decide is genuine, coupled with the "I've a lot to think about" nonsense, well then he should be left in peace with his profound thoughts.