Diomande will go for way more than Gittens.Gittens had a good season at Dortmund last season and cost £48m. I can't see this lad going for much more.
He is a better dribbler, and a much better creator than Gittens produced in his Bundesliga campaigns.
Gittens played 83 games (4300 minutes) for Dortmund in his last 2 seasons and had 22 ga.
Diomande has 22ga for Leipzig in just this season alone, in 36 games (2700 minutes)
These are not comparable talents.