Am I saying he’s perfect for Arsenal? Not really. There are a few caveats. Will Wenger arrange the system around him? That’s one.
But the other comes as part of Lucas’ main issue: he takes a few chances before he puts one away. That may frustrate some, but it’s also worth looking at the other side of things: will he score more if he’s less inclined to snap away at the half chances he creates and simply latch onto a perfectly weighted pass instead? Lucas also requires a bit of freedom if his game is to truly prosper. It’s far from clear what his role will be, but he is an upgrade on all of Arsenal’s wingers (bar Alexis) at the very least.