As a winger yes, but as a player, I don't think so. Greenwood has clearly come on leaps and bounds. As a forward, he is already a fantastic player. However, he's not a winger, and especially due to how static our midfield 2 can be, that is what we need. He doesn't have the ability to consistently beat his man or create space for himself to drive the ball to the box. He's not very inventive. He's creative for a forward, but not for a winger. It's pretty clear his future is as a 9 or a second striker; in some systems maybe even as an inside forward, but not a winger expected to support the team in possession or creatively.
Sancho is a winger. He's the creative force we need that can work possession and chances. Unfortunately, I don't actually believe Ole knows how to get wingers into favorable positions. If you watch most teams, their team, not just the individual, creates the avenues and platform for the wingers to cause havoc. At United with Ole, the only way to get favorable possession is moving centrally, which is a far too congested space to spark the type of magic we expect from wingers. Our fans talk so much about how the players that we have don't get enough of the ball and hence blame them instead; I feel that the attackers ( and moreso the wide players) have to fight way harder on a game to game basis to get involved in games due to how we were structured. Rashford was the only one under Ole to provide consistent performances; that was due to his amazing off runs of the ball more than anything else. If not, our wingers are usually trapped having to fend off 2 to 3 opposition players every game.