I agree with TRFC_Ian to the extent that Alan Mahon hasn't really impressed since his return. Barnes played him wide-left and under Les, he's been restricted to a few cameos as sub only impressing in the Southampton game. He's still resident on Wirral (Willaston?) so am not sure that he wouldn't have come if only offered 2 years and if that was the case, we should have said no.
Of the out-of-contracters with offers, I'm not surprised Zoum hasn't signed and Welsh may think he can do better elsewhere. Curran is an interesting one, the fact he was on the pfa website as out of contract, when others weren't suggests he's putting himself in the shop window. However because of his age and the fact he was offered a new deal, I think any club taking him on might have to pay us a fee.