Stiglitz is likely the best they could have recruited. I would prefer Varoufakis, but perhaps he is seen as being too radioactive. Stiglitz and Krugman both oppose austerity yet are still seen as part of the 'mainstream', unlike Varoufakis and Keen. Being part of the 'mainstream' does have its advantages.

"It is not necessary to have hope in order to persevere."