It's not low risk. Lance fucked up both his former teams by his mere presence, although it's arguable whether his contributions to the Pacers outweighed his being a clown.
Doc has a decent chance of making it work, as he was able to get the most out of a knucklehead like Rondo. He also has the fabulously bitchy Chris Paul to also keep him in line
Definitely not low risk with Chris Paul around.
I predict they will not get along, as Paul is a special little flower when it comes to managing the ball. Stephenson will have the same problem he had in Charlotte with Kemba and Evans, and Paul is a nasty political operative, so even if they play different rotations, he can still undermine Stephenson. Paul is a Kobe-lite when it comes to guys wanting to play with him.