I had this issue the other day with my two accounts. I was having problems with my secondary Gmail account and so deleted it and recreated it. It then ended up on top of my primary account in the list which I didn't want!
After much faffing about, the only way I could get around it was to delete my primary account and re-create it so it then went to the top.
Possibly not the best of solutions for you - but it's one workaround.
Rod.