While you are partly right, including a split rune for the split you're building gives you that one extra space of flexibility, because it counts for the 2 factions. For example, building FW/IS with Soul Reaver gives me 1 flexible slot to add either FW or IS. If the rune is also worth it in that split, it's just great.
Nerf: Call to War (tis kinda op), Roar of the Fallen (tis too cheap), Krikkenwing Alpha (Shimmering Wings tis too cheap), maybe Vex, Mauler (just Sibling in general) Buff: Akakios (I like him but he still feels a little lacking), Prismatic Skywing (Too expensive for what he does), Skywing Patrol (Fails on so many levels), Draksar Consulate (again fails on so many levels) I only really play Dragons in SL so other than the obvious stuff that's all I'll comment on, others can give better insight into other themes.
1 Nora. I mean, I agree it's not that strong as the champ needs to die, but 1 Nora is just too low for a global debuff like that.
It's nice to look at the abillity and be able to say that is cheap, but here's the thing: Are the champions with this abillity too strong? I used akakios, and he really isnt that impactful neither with roar nor with annihilate.