i guess we need to define"successful" and this logic applies to any stables/horses
for example how did the horse(s) finish up the year, were they better than they were during the early or middle of the year
what did they earn or better yet what did they net out at the end of the season and who made money??
of course you cannot and should not judge a horse based on solely on their 2 yr old season
i guess if you paid $20 k for a horse and it made $35 k in earnings as a 2 yr old you might consider that a moderately successful foray