I think it really can, they both are strikers in the first place( not a pure no 9 though but still strikers) played as wingers or wide forwards which is not completely suited to their natural game , and they came here with that idea of being strikers at this club. I think we can all agree that they'd be best used in a two striker system, their best qualities lie near the box and inside the box with their pace, movement and dribbling skills and now asked to play as wide wingers and be in charge of what wingers are asked to do on the pitch in terms of attacking and defending with or without the ball, and still were were developing well until Sanchez came along with a better defensive work rate and huge experience. Who knows when used in the correct way they could be something else in a more dangerous way to the opposition and we are being deprived of that as he has a history of doing that.
Conte came along at chelsea inherited mourinho team, fixed the balance of the team with a 343 system and won the title with plain and simple solution. Mourinho is still struggling to find the right balance by targeting unrealistic players who don't want to come here or its super difficult to price them away from your main title rivals and not adjusting to the squad at hand. Little flexibility and simple solutions can get the best out of the squad at hand which is being deprived off and everyone can agree to that.
Now I really don't think you can blame Ed woodward for not delivering a RW as mourinho is also equally culpable with the wrong recruitment of Mkh over Sadio Mane or Willian in that position in his first window itself when it could be more easier to fill that place. Now weather Mkh was Mourinho target of Woodward Fantacy is really a question we can't answer with conviction but its poor planning when you think now Willian will be sold by Chelsea to united after what happened with Matic comming here unless its a ridiculous price. All the Media including united legends ridiculed Chelsea over Matix sale to united, why would they be making the same mistake again unless its a ridiculous price or they are getting something in return?
Now if you don't want to use talented players on their strengths when those talents came here thinking their role in the team would be different to what they are being forced to donow, in this modern footballing culture its super easy to find another clubs which might get the best out of them. So if its not working out for them they really don't care, the manager won't care either and the disharmony and unbalanced teams continue to roll out again jeopardising results and quality in the process. It's easier to be flexible and adjust to the qualities of the squad at hand sometimes then to force the system on the players which are not suited to it.