Sadly Balde is crap defensively as well and we have no one else to play LB.
Confidence can do a lot for a player, and you get that by starting, especially as a young player. You can tell Balde is mostly focusing on keeping it simple and not making mistakes, but for a young player just starting with the first team, that is a good first objective to strive for.
Lewa was expecting more from him offensively and tried to direct him a few times last game. I cant blame him, but I think Balde will start to make those runs as he becomes more comfortable- he has shown he has the dribbling and pace to do so.
I say keep giving the kid a shot, see what he can do. None of the LB we've been linked with are worth wasting money on since they likely arent better than Alba and not worth keeping Balde from developing. If he develops, we got more money for a DM and RB next year.