This was because Falcao wanted out. Apparently, his favorite teams Real Madrid or Barca didn't come for him. Monaco was ready to offload him. In the end, all messed up and Man Utd just needed a striker for RVP injury worry. Falcao also didn't mind coming for one of the world's biggest teams on loan. So it's how ended.
i don't thibk the owner can afford him anymore
So that when Welbeck gains more experience and gets better by the next season, they can buy him back and they won't need Falcao anymore.
why not?
The backer of Monaco has been through a costly divorce and either has lost the will to put more money in or cannot afford to depending on what report you read. Basically, they cannot afford him now...
Fergie from his retirement bed said he would kill the front office in Monaco.