Without get agreement both side between Pogba and Manchester United next window transfer opening Pogba become free transfer player and all club looks easy to get his sign's,
I think that's what Pogba wants. If he were on a free transfer, he could demand a much higher hand money in contract negotiations with his new club. It was similar with David Alaba, for example. He had rejected contract offers from Bayern again and again for a long time and gained time until Bayern could no longer sell him with a transfer fee. In the end, he moved to Real Madrid last season without a transfer fee and got a big hand money from his new employer.