Ok I mean he would just wait for a set up where the #1 will be short, but has a bad habit of running/jumping straight right at the start and it struggles to run distance, #2 is a good early speed dog but tires badly suggesting they both check or hinder each other just after the start.
#3 is a non chaser.
#8 is perfectly drawn wide but does miss the start sometimes which is the worry.
#5 has been a shade unlucky after being checked early a few times when just close to lead.
So two different trifecta setups here,
If the #1 doesn't get checked early 1/3-8/3-8-5
If interference may happen on the inside
the other setup would be something like this.
8/3-5-6-7/3-4-5-6-7