If you don't think Dobson is a realistic medal contender, I'd argue that Anning isn't then either. Charlie is ranked 10th in the world this year. Amber is ranked 9th. I'd say those 2 are about the same. In terms of time, Charlie is actually about a quarter of a second closer to the podium than Amber.
Personally I'd swap the men's relays around. The 4x100m if they get the baton round cleanly should be on the podium. I don't see 3 teams better than us. Obviously you can never guarantee the baton going round with any sprint relay but if we are purely talking raw speed, I think you probably would put us on a podium with the US and Italy.
On the other hand the 4x4 team has two outstanding legs and then 2 slightly iffy ones. They could be right up there but it wouldn't be crazy if we were in a tough battle for minor medals.
If we send out even close to our first choice mixed team (ie a team with Charlie, Amber, Laviai and AN Other) they are strong medal contenders, but obviously as per our discussion that's an unknown.
Finally, I'd add Holly Bradshaw into the outside bet camp. She jumped 4.70 last week, which is nothing special but is getting around the distance where the medals have been decided in recent years.
I'd also add Hughes into the outside bet category, for his past exploits. 10 flat in what is essentially his first race of the season is solid enough.