I will take Tello any day of the week over Pedro. All Pedro ever had going for him was his workrate and the fact that he'd put himself in position to score a decent amount of goals. The latter has been missing for over two seasons, so....
Tello and Neymar are both 21 and already much more of a threat on the wing than Pedro ever was. We need wingers that have confidence and the pace to take on defenders, without it teams just stay compact in the middle and triple coverage Messi- which made it simple for big teams with good defenders to shut us down.