Alright, i see what you mean.
I just don't like to mess with other people's plotlines. I'm happy to help, but I don't want to intrude. One the most frustrating things to deal with is when you have a plot idea to go with and you have to abandon it. So, I just let things be, unless someone wants me involved.
As for the specific circumstances, I'll have to find some excuse for my charecters to get involved, since I don't think any of them have met each other outside of battle.