One could just rely on the Don Scott asessed price and bet those that are better than their asessed price (A profitable way to go).
After all they,ve done the work for us.

Barny .I like your style and comes back to PROFILING each horse in the top 6 (the best way to learn horse handicapping)
Horses and trainers are creatures of habit.What they,ve done previously is likely to be repeated.

Beton is correct .The only way to win is to get better than your asessed price
whether that be betting 1 horse or many.
I,m not generally in favor of 1 horse betting myself as there is always a danger or 3.

The other thing with relying on someone elses asessment and pricing is to make sure that the track conditions as rated for are the same as todays track conditions.

Cheers
darky