Interaction between Default Attacks and Activated Attacks

So if I play, e.g., a Death Knight, using Markovian’s Advantage, Zolhan’s Technique, Reaping Strike and Necrotic Edge, I would achieve 100% activation chance (25% times 4 skills)

According to the game guide here the chances are additive and each attack will be one of the four. In other words: My default attack will never be used.

What happens then to the boni of them, in this example Cadence.
Are they just unused? Does a activation based character even have a use for a default attack?

first two cadence hits would always be one of the 4 WPS, but the third hit is overridden by cadence and uses no WPS ever


So it’s probably better to not use Cadence but Savagery (I’m a Warder)?

As far as I understand it Savagery and Fire Strike fully interact with WPS skills, right?