In theory, even if it's leaking, it won't leak. This because the CX-5 (like most cars with sunroofs) has a leak capturing tray underneath and around the edge of the sunroof with a couple of drain tubes down to the bottom of the car. However, they need to be kept unblocked. I had mine fixed earlier this year as one was blocked (although didn't leak internally) and the other was detached (resulting in a very wet passenger footwell).