Hi Julia
I was working on a dating app for Career Transition and can vouch first hand for the effectiveness of having a Sponsor/Advocate, in particular your point about them being different from the rest in the sense that you are not physically present most of the time when they are advocating on your behalf.
As always I think your articles on Career Planning are awesome - thank you for taking the time to put them together - I took the liberty of sharing this one on LinkedIn so that more folks can benefit from it.
Best wishes
Savio