He seems to have matured quite a bit as a player; workrate, tracking back, tackling.
He put Snodgrass and Adomah thru several times, unfortunately their endproducted ended up in the opposition.
His ability to take the ball with him and break away from the midfield pressure line. Or to pass it thru to players further up the pitch is much needed. He's the only one with the ability, or confidence if you will, to do so. We end up passing sideways, get under pressure, lose or kick the ball away aimlessly far to often.
He'll be crucial to us the last half of the season. Sadly the team does not seem to be coached to reap the benefits of Grealishs ability. Or we're lacking the players.