Why would he weaken his position when negotiating a deal? Utd involved helps get better deals.
It's a different club.
An absolute colossal club with arguably the best manager in world football at the helm, not only that but playing in the most competitive league, getting one of the best wages out of any club.
There's a lot of reasons for United, the club has fantastic training facilities too I just see United as a great club, Pogba also plays with Evra don't forget at International level AND club level..
I don't think it's a bad club to play for, there isn't a huge gulf like people suggest in regards to Real Madrid, football works in cycles. Real Madrid won the CL yes but Ronaldo is starting to drag his heels a bit he's getting older. He won't last another 3 years at the top level (scoring 50+ a season).
United do have some really young good players Mourinho is a greater manager than Zidane and you don't have to deal with Perez so although it means something to play for Real, United is equally as big of a pull and you're going to develop more where each game really tests you.
I wouldn't be amazed if Madrid sign Pogba, working under a french Legend at the most decorated club team in the world is great but United aren't a small club, it's had a rough 3 years without SAF but now it has Mourinho, new era and new chapter.
Having the same agent in Raiola also helps, he can communicate the plans of the club. The ambitions and the fact you'll be the superstar player, unlike at Madrid you may not always be appreciated.