Awful transfer from us. Send him somewhere where he is far from guaranteed playing time, even Championship football could have been great for him to build confidence and fitness and score some good goals. Thats lot better than play 10 minutes every third match in the PL.
Btw it hardly matters as if we sell Dzeko in the summer I dont think Guidetti would have chance to fill the 4th striker role even if he would be scoring a lot at Stoke. We would go after a proven goalscorer easily in the market.
And if we dont sell Dzeko or any other striker, next year again has be a loan season for Guidetti. Or just sell him.