Chelsea signed Nicolas Jackson and sold Kai Havertz in the last summer transfer window. Their goal records in the Premier League this season are practically identical. In 32 appearances, Nicolas Jackson has scored 13 goals, while Kai Havertz has registered one fewer in the same number of games for Arsenal. Even so, former Chelsea player Craig Burley thinks one has been better than the other and by some distance. Another former Chelsea star, Demba Ba, had some positive things to say about Jackson after his two goals against West Ham United over the weekend. Craig Burley on Chelsea’s Nicolas Jac…