Without a doubt, ...the drop rate is different for champions
Anyone disagree? Especially in 5* pulls. They are, imo, limiting the more desirable champions in favor of those no one wants. This isn't in response to a bad pull, just what I've seen. On a personal level though I have gotten 5* Spider Gwen, Khamala Khan and Jane Foster in consecutive pulls. I also have HBuster, duped IP and others that could make you cringe.
Just a thought I had while I'm sitting here bored