Unlike Oxlade-Chamberlain, Bale and Walcott who were sold having only played League One or Championship football, Shaw already has shown himself to be more than capable to play at Premier League level aged 17 for Saints.
Plus when Bale, Walcott and Oxlade-Chamberlain were sold were either in the 2nd/3rd tier and/or didn't have the Liebherr estate funding the club. Things are very different now, as I'm sure Cortese will tell any club bidding for our players.