Everyone will probably think this is really stupid but before the Protector's names were revealed I used to have a head canon/theory type thing about G2 being connected to G1. It isn't really a theory since I knew it wouldn't ever happen but it was fun to make ideas.
Basically, the Toa Nuva somehow were transported into another place in space and time, most likely to save Okoto(though against their will). When they were gone for too long, The Toa Mahri decided to use the Mask of Time to go after them, but something went wrong and they ended up arriving in Okoto too early. The power to used the Vahi also drained them and turned them into Turaga. They renamed themselves as protectors, ditching their old masks in favor of the Okoto ones to fit in with the tradition. It would have explained why the PoE had a Gatling gun on "his" chest, as Nuparu was a bit of an engineer. They had children and named them after the Chroniclers Company.
I know Matoro died but just assume he was brought back somehow in the process.
Just thought I would share. Of course it has been debunked now if there was ever any chance of it being real.