Recently the Electrum team started providing 2 sets of signatures from 2 of their developers, I suppose to make things safer and more decentralized.
I suspect you're correct. That would make things more decentralized, and it's a good plan going forward to keep things transparent. If (god forbid) anything happened to ThomasV and suddenly the team had to use someone else's key to sign releases it would raise a lot of questions. Especially if that someone (like Ghost43/SomberNight) was an anonymous figure.
Anyway, I browed to the Electrum download page today and noticed the following, for some reason the MacOS releases are still signed only by ThomasV:
I also noticed that two sets of signatures are available now. I don't believe that was the case when I downloaded version 4.1.2.