Hm. Spark is a choice, but perhaps what the group needs isn't a person who had already had some experience, giving that with Sparks attitude she might not get The best out of The team, but rather someone who is unexpected and who will grow to become s good leader. Like....
Lucy. Or Roxy. Or....I can't remember any more names 0.0.
Then again, it probably would be interesting have spark as the leader