"...if you have observations on what year you see the most changes in a seedling?" I see this question all the time and for some reason people seem to think that seedlings change a lot from year 1 to 2 or to 3 or even 4. They do not but the evaluator fails to recognize the negatives especially in the first year and continues to have blinders on in the second and third years. It is easier to say it "changed " than "I did not evaluate it very well."
Dick Parshall says he grows the seedling for at least 5 years. Using my observation above, he must be partially blind.
Having made you laugh, I will state that if a variety is susceptible to a disease it shows up in the third year. HH Ballerina has been pulled from possible distribution as it catches fungus diseases. It was a crowd favorite at our open house. Virus susceptibility shows up in about the third year. Yes, there is such a thing.
Lack of tubers is a self revealing trait. "I can't seem to get enough tubers to release it." said the late Bill Mishler.
Remember that the age of the breeder may have something to do with this. When you are in your late 70s do you want to wait a couple of extra years to continue to evaluate it? Margaret's best seedling from the 2024 crop makes lots of tubers. It is an amazing color. Shall we wait an extra couple of years to further evaluate it? 
Scorpion a 2023 seedling will be sold in 2026. I like crazy flowers like this one and it is over 6 feet tall too. Crazy form and bright colors and certainly not a classic "show" flower.
