SegSig is a larger update then PoW2, I still want to see how MaNI pulls off 58% savings on SegSig when the bitcoin devs could only manage 25% on SegWit.
Sure I will grant him best dev in crypto status if he manages it.
BTC carries the burden of keeping old/long time outdated nodes on the network, limiting the savings alot for another couple versions (translates into years!).
They are on v0.15 and I still see v0.10 nodes on the network.

During the activation phases (giving users time to update their wallets), Gulden 2.0 will leave old 1.6 nodes step by step behind and is than free of that burden.

Pretty sure this is part of the magic.
Still doesn't take anything away from the great dev work.