Just noticed if you lose a system to a crisis event (Unbidden for me, doubt for any of the others as well) you don't get an automatic claim to those systems.
If the unbidden came in and cleared a load of your space and you were to later clear them out but somebody else rushed into and built outposts in the systems before you got the chance. Surely you'd still have a legit claim to those systems that you could press in a war without having to waste a load of influence (which not having enough might be why you didn't snatch them back up to begin with) claiming them all to later fight for them back?
If the unbidden came in and cleared a load of your space and you were to later clear them out but somebody else rushed into and built outposts in the systems before you got the chance. Surely you'd still have a legit claim to those systems that you could press in a war without having to waste a load of influence (which not having enough might be why you didn't snatch them back up to begin with) claiming them all to later fight for them back?