User blog comment:KaiserLos24/Kalista Wombo-Combo's/@comment-24057740-20141107162348/@comment-7630509-20141113162006

You bring up a good point. Melee characters cannot trigger Soulbound regularly. However ranged characters cannot utilize the ultimate gapcloser because they land at maximum attack range from their target (Sona and Nami are safe when they ult in unless they don't hit anyone).

To make matters worse, melee characters with long range poke and large AOE CC spells are rare, and many of them end up in mid lane (as you mentioned, Galio, but also Yasuo). You either have to choose between long range AOE initiates (Annie, Nami, Sona) or ranged characters with gapclosers (Thresh, Kennen) but characters such as Lulu (short ranged AOE CC, but ranged so ulti fails to position properly) or Alistar (cannot proc soulbound regularly despite ultimate synergy) will be unable to fulfil Kalista's requirements