What differences do you see between Nagy first year 2018 and BJ this year?

This season is very reminiscent of 2018. New offensive coach comes in and takes over with 2nd year, highly drafted QB. Vibes are off the charts, Club Dub/Good Better Best. Bears shock by winning way more games than expected.

I don't care about double doink, but I care about the seasons after when it fell apart. What differences do you see mainly from the Nagy side of it compared to BJ that gives you confidence this is not a one season illusion like Nagy was and we actually have our guy for a very long time.