I agree with that thought process, especially if one of your 2,3or 4 horse is a price.
Derby that comes to mind is the Always Dreaming Derby.
I keyed Irish War Cry and was all over Looking at Lee.
Tri paid approximately $8200 for $1.00

Since that Derby I have often thought of having two key horses and not hitting the all button.
This year I just may use that strategy as there are a lot of closers.
Currently looking at Rodriguez and Journalism as my keys, subject to change.

Sure is quite around these parts for the silly season.

Good Luck
John

P.S.
Is there a chance the top jock won’t have a Derby Mount?