Deulofeu is only one year older and when he was playing at Barca B, he scored alot. Arnaiz is still at Barca B for a reason, while Deulofeu is already playing at big leagues for years. So don't get your hopes to high yet. We will only know when he starts playing with the big boys for many games.
He is pacey, direct and has a good zing on him but he is very raw and makes a lot of stupid decisions. Can see likes of Alena get frustrated with him at times.