I want to say, that it's a risk both options. Pato's case is a risk because of his health, but he has proven himself in top level and is he is healthy can be really usefull for us. He is only 24, he have many years to progress. Is a player that needs more confidence, if he is healthy and have this, we can solve our forward problem.
Morata is a risk to me, for his value. We mustn't pay for him over 10m. He is nothing close to that price. If we pay for him an important part of our badget and he never adapt...would be a real problem. In u21 level we can see a lot of promising players who never adapt to demands. That case is Morata.