DCL is far more aware of what's going on around him, and who's where. He almost a target man, he has pace, but he's operating as part of the team in a way that others only tend to do indirectly.
Niasse is direct and relentless a bit like Vardy, in terms of lots of graft and not many touches. A look through this season, he's pretty much the only player who is winning possession back in opponents half. But he's a head down and run type player and if someone comes into view, he'll see them.
With Sandro, I think it's about finding ways to utilise his pace. Defence splitting passes and using his pace to create space for others. He has a great touch and a superb technique for shooting, but he doesn't have a lot of time on the ball or retain possession in tight spaces.
DCL offers us the chance to build more well rounded attacks, as he can link up and chances created are more design than luck.