Thought he had plenty of space to operate in the first half, the issue was not playing the right option and too slow in decision making. While we dominated the first half both him and Johnson really added bugger all.To afford Son more space to operate in his best positions you need Udogie to overlap which is not his remit under Ange or you need a midfielder to drift wide left to occupy and drag defenders across.
This is quite possibly why we've pursued the likes of Eze, Doue and to a lesser degree Ramsey this summer who all have left side bias coming from inside and as such can aid Son in this system.