It also comes down to what Willock wants and I suspect, after his stellar loan, he'll want playing time. He won't be a starter here next season for various reasons (tactical and ability wise). If there's concrete interest from clubs I think it would be benefical for both parties if we push for a transfer.
Indeed it does. But that will be primarily influenced by what Arteta & Edu's plans are. If they can say to him they expect him to have a long term future at the club, and after his loan they want to integrate him into being a regular (and in a way that makes sense), then he'll want to say. If they are still umming and ahhing about how to use him, its best for him to go.