I read the Ducker article. It doesn't add much value. There is this idea that is being peddled by pundits and journalists alike that di Maria is a 'cherry on the cake' signing with no cake yet. It's not a well thought out argument IMO. If we have a look at the squad, we have been in need of 3 positions being addressed with quality to world class players needed, being CM, CB and Winger. If we look at CM, we needed 2 CMs, one creative ball carrying CM and a CM that can play box to box with strong defensive qualities and who is highly mobile. We've addressed the first part one by signing Herrera. Further, Herrera along with Mata as a combo can take care of creation. We need a another box to box CM which is not the easiest to obtain. Seemingly our main target here, Vidal has knee issues and there aren't others around. Going for Kroos or Cesc would not have addressed this issue either as Herrera already takes care of that dept.
Further, class CBs just aren't around and are mostly unavailable. Dortmund refused to sell Hummels regardless of what we would have offered. Looking around, there weren't that many targets available to pursue on this front. Benatia might have been an option however, if it is true that Bayern are in for him, then he was always going to prefer them due to UCL. Again, I don't see any world class CBs around. It also further assumes that Rojo, Smalling, Evans and Jones won't improve.
Di Maria then became available in an area that needs addressing. Question then is, should we have passed on the opportunity simply because we have not able to secure another CB and CM? Of course not. Thus the argument of Ducker that our transfer strategy is 'scatter gun' like is nonsense and not thought through. Our main areas of concern has seen us sign a CM, a LB, a CB (who can play LB) and now a winger. If we add a class CM and another CB to that it won't be 'scatter gun' would it?