Smith can definitely go under the mark based on his 500. They will all have to go out faster but anyone who goes 4:10 or faster should be able to make the Olympic A cut and there are several guys in finals who can do that.
Meanwhile, Michael Andrew total blew the doors off in the 100 breast prelim. If he can swim that time again tonight and tomorrow I don’t think anyone is going to be able to match him. I wonder if this performance means he’ll scratch the 100 back tomorrow (he may have already).