you said a skillchain and then that implies the next word fusion would be a skillchain as well not a property.
regardless almost no sc-mb fight has the cor shoot enough for 2x ws between sch sc.
That's what alliances are for, lol. When dyna D was just out we did mage setup in bastok and thunder nuke wave 2 boss. Since there were 2 cor in alliance 2nd one can always close 3 step with aeonic.
Obviously as alliance discover more optimal setup battle strategy changed: now we just melee zerg wave 2 in a min and leaden all thing from wave 1 to 3. So that make dp more relevant currently.
But my point is that my experience of playing cor, I have to be far more versatile than just leaden/savage. Sometimes I'm there to close fire mb, sometimes thunder, sometimes water. Sometimes I'm there to shoot, sometimes melee. The job never stuck in 1 playstyle because the nature of it.
So I find it weird that lionheart, a DD weapon for a tank job got ranked so high but Fomalhaut, which adds quite a bit of utility to cor as a whole are considered inferior.