Just a thought,
BTC was made with a small budget by one or a few peeps as an experiment...
experiment was to test lots of things..it passed almost all tests..but had some major flaws discovered after a few years of BTC launch
satoshi has to choose, keep patching up early code, but this will make things worse long term, and he has a bigger vision , he realises BTC cant do it and he needs a bigger fund.
so he decides to create a new coin...but cant use the satoshi name as it will have a very bad effect on BTC price. How many devs have made more than 1coin and been succesful with them both? dev making new coin pisses off old coin community. (if cobbles made a new coin , ltc would die , if evan made a new coin dash would die)
what if satoshi is directly involved with eth....
pump btc price to ath at same time do a first ever crypto ico...no need to touch btc premine

then theres the main man... Nick, The last known public communication from Nick Szabo was in November 2013 ( same time as btc ath ), leaving many to wonder whether he would ever post again. The seven months silence seems to have followed increasing attention on Nick Szabo after numerous suggestions that he might be Satoshi. In April 2014, researches from Aston Universitys Centre for Forensic Linguistics claimed that forensic analysis of Bitcoins White Paper suggests that Nick Szabo was the author of the paper....
https://www.cryptocoinsnews.com/nick-szabo-bitcoin-founder-satoshi-nakamoto-breaks-silence-tweet/ETH launches and Nick comes back

...
https://twitter.com/nickszabo4?lang=en-gb/ Nick Szabo @NickSzabo4 Mar 2 Nick Szabo Retweeted George Hallam Why has Ethereum been headed towards the moon? It's computer science, not rocket science:
He makes an extremly rare appearance only for ETH...
https://www.youtube.com/watch?v=7Y3fWXA6d5k - DEVCON1: History of the Blockchain - Nick Szabo
coincidentally at around same time btc weaknesses become increasing exploited.
Im begining to think we got satoshi with us
