From my master Gateway router (Router number 1) can that router automate the connected routers to perform updates inline with my master router?
So, if i apply updates to Router 1, the other routers follow suit? It would would make life easier say if i had 5 or more down the line. Saves 5 logins and repeating myself numerous times.
But it's all linux underneath, and you have shell access over ssh, so anything is possible - but you would have to write the necessary support yourself (I don't think luci-app-attendedsysupgrade would cover your expectations either).