[@ImportantNobody]
The second one seems more entertaining. 

As for reasons, why not have it that the Dark threat acts mostly like those we got in circulation and the magical girls were contracted specifically to counter that specific threat but sometimes you get the ones who wises up and gone into hiding (with all the power ups from seasonal progress). Then they re-emerge years later and beat back the new magical girls contracted to fight them because they got more power ups and few years of build up compared to the newbies. Finally, the mascots realize that the Dark threat was an old foe so they get into contact with the old magical girl.
:v

As for me not being around here much: Warframe is fun. :v