I disagree,they are still on a high and all 3 promoted teams last season stayed up
The promoted sides staying up has literally no bearing on when they were easiest to play against - it just means they were less shit across 38 games than 3 teams who'd been circling the drain for ages in Stoke, Swansea and West Brom.
Them being on a high is one of the reasons they're vulnerable. I'd much rather play a team who have their tails up and think they can bring it to us than a team who have no ambition of doing anything except park the bus and hit us on a speculative break.