This series is actually kinda fun. It'll be interesting to see how strong the party actually is. Considering Luck was able to hold off a Majin by himself, the party should be able to decimate everything.
Just like so many other posters, I think something is going to go wrong. And I think that "something" is going to be that the high lord mind controls these 2 guys coming with the mc to have a 3v1 fight with the mc.