#3 Zlatan won't cost United a fortune
The cost of a quality signing in the current transfer market is very steep. The cost of a proven Premier League striker will definitely be off the charts. The recently concluded transfer business hints that United's valuation of players might vary from the actual valuation of the market. In short, United are wary of spending huge amounts on players on a whim.
In such a scenario, Zlatan comes as a blessing. There will be no steep transfer negotiations, there will be no prolonged discussions. A loan deal makes everything simpler and yes, he will require a huge salary, but in return, Manchester United will be getting someone who is used to the United way, who will be a statement signing and who is proven in the Premier League.