Hello dear :) you seem to have excessive knowledge on the background of SPN ( BTS to be more correct ) . Was there a time where TPtB tried to promote Misha as a third lead ? I notice he was in numerous pictures with just Jared and Jensen , there also used to be j2m panels sometimes . If it's true , I'm happy it didn't work .
I think they promoted Misha as “back up” rather than 3rd lead. In case Jared is unable to continue to work due to his clinical depression, they can just sliiiiiiiide Misha right in.
It may seem cold but remember that there is a pretty strong stigma against mental illness for making their sufferers unreliable for work. And on a show where you only have 2 leads, you are fuck out of luck if one of them becomes incapacitated. Look at what happened to others shows when their leads ended up in rehab during the season, the show suffered, storyline foundered, and ratings take a hit.
But Jared was able to continue to work in part because he was a strong support system that includes Jensen, who has credited Jared for helping him step out of his shell and comfort zone. The Js are a strong team. Meanwhile, Misha ended up just waiting around for his turn, he wasn’t even the bridesmaid, he became Miranda babysitting the guestbook at her crush’s wedding (re Sex in the City). I think it explains Misha’s jealousy and single-white-female-ing Jared because he thought he would take over Jared’s place one day.