Show quality is only an opinion...until the fish is actually in a show.
I know buying from many dealers at once is a bad mistake...but I definitely understand the temptation. After all...We go into this hobby for a love of koi. If we see a particular one we like...it stinks to feel that it is not safe to buy it!!! I have discussed this with my local koi dealer before. He only gets koi from one closed farm...and as a dealer, he keeps a closed shop...nothing ever comes back, and nothing from any other koi farm. BUT, I do say to him all the time...If I can't have what I want, why even be in the hobby?!?! If I'm going to go to a show...and a dealer is going to have an outstanding specimen to dangle in front of my nose...what fun is the hobby if I can't purchase it?!?! May as well take up stamp collecting instead.