I'm not sure that's true. You're saying most prospects are given a chance to start and then put in the pen when they fail as a starter....after dominating as a pen arm, they are put back in the rotation? Is that what you're saying? I don't think that happens too much......nor is that what I was saying.
I'm saying relievers turned starters get injured more and have poor results. To be honest, the article may have been looking at converted relievers in their 2nd season as a starter....I think it says they generally do well in their first year - but the results fall off the table in year 2 of the conversion. I read the article like 3-4 years ago.....little fuzzy.