My take on Doku is he needs to improve his possession game if he has designs on Grealish/Bernardo role on the wing or become a technical winger like Sane/Mahrez. His goal contributions in his previous club has never been stellar. Obviously he has attributes that could possibly develop to something useful that made the club to sign him.
Honestly not impress with this performance and was not particularly pleased with his signing but as it is, he is now a player for the club and he gets my full support. I just need to see better next time.