Abarekiller, while he operated outside the team for the most part, was only a fifth ranger (I don't count AbareMax, since it was just a powerup). Between that and the zillion extra Dekas, it's more like "extra rangers" than "sixth rangers," strictly speaking.
I generally don't count characters such as Ninjaman, Signalman, VRV Master, and Bullblack as rangers, but that's just me.
...and is it just me, or do the coolest extra rangers always die? I was actually kind of disappointed that they *didn't* kill off Doggie at the end of Deka. An Afterlife Sentai Deadranger composed of DragonRanger, TimeFire, Shurikenger, AbareKiller, DekaMaster, and Yellow Four with Kiranger as their mentor would totally rule. :anime: :buttrock: I mean, it works without Dekamaster, but it's so much cooler *with* him.