Com'on man, don't just conclude yet, don't you think that Nicholas Jackson is definitely an upgrade to the attacker at Manchester united?
It's true that he is very wasteful in front of goal but you can't deny the fact that he is very good at creating goal scoring chances, so he is not that of a terrible acquisition for Manchester united in my own opinion.
As for the swap deal, it makes sense because Chelsea want to add another winger to their team, while Manchester united is looking for an attacker that can also function as a winger, so Nicholas Jackson fits in to that category of players Manchester united are looking for.