It's an interesting idea, but the rank system is meant to show progress through the Pridelander pride - as in, only the lions in the first TLK movie. To progress through a pride, you become newly blessed and then you grow into a cub and an adolescent and so on. One wouldn't jump from being a Pridelander into being an Outlander.
However, I have thought about adding a special rank for members who have been inactive for a long amount of time: Rogue. But, again to be a Rogue would be to possibly jump around in the ranking system. Jumping from being a cub into being a rogue wouldn't make sense because there are no rogue cubs. (In lion terms, rogues are male lions who are kicked out by the dominant male once they reach a certain age.) The fact that the term only applies to males is an issue too.
So, good suggestion, but I think we'll leave it how it is.
