To answer the British questions:
Whitlock retired from the all-around earlier this year to concentrate on individual apparatus but it seems he may change his mind now,
The other GB men, Wilson, Cunningham, Hall are good but probably not quite good enough to win all-round medal. All could finish top 6 in the world on a good day but I can't see them breaking into the top 3
The women's performance this week was disappointing but understandable.
Fragapane and Tinkler are injured, the Downie sisters are only now returning after both being injured for more than a year,
And there were two 17 year olds making their world debut.
I think with all their best team available they should be slightly better than the Canadians who finished 4th but probably not good enough to challenge the big 3 nations.