Gundogan is a brilliant signing. I only mentioned Bravo because it's a one man position whereas we have Fernandinho and Silva who can play in CM who are on a similar level. Likewise with De Bruyne and Sterling, both have improved our team/squad but we have a lot of options in those areas. Goalkeeper was a position that needed a massive upgrade in my opinion, very excited about this signing.
I see your point but I still believe you are massively underestimating Gundogan, he is amongst the best centre midfielders in the world currently.