I know this isn't your main point but I don't think Suzuki and Ceasario are in the same league, so much so that the comparison doesn't work for me. It would take a TRUE implosion from Gracie for Sam to be able to beat her. It only took a few errors from Mao, at times, for Suzuki to beat her. While I think Suzuki was one of the most underrated skaters of all time and so I can't say she was always a medal threat at every competition, I think it is fair to say she was a medal threat at every competition but Worlds that she entered (and she even did eek out her one World medal). Sam winning the kind of medals Suzuki did, at this time, is absolutely unthinkable. And I am a fan of Sam.
(Please note I am talking about the last years of Suzuki's career. She was obviously a late bloomer and a lot of this would not hold up in her early career, which I know)
Suzuki, FWIW, made humongous improvements in those last few years, including working on her flutz (which was somewhat successful; she often ended up popping the jump, but she ended up with a few ratified triple lutes), adding a consistent 3-3, which she didn't have during the 2009-2010 season and just working on her basic skating. Also Mao Asada also was inconsistent due to reworking her entire technique during the 2011-2014 quad, allowing Akiko to sneak in and get a few wins against her.
I too think Sam can make some big improvements in the years to come, but Gracie isn't reworking her technique, so there isn't really a huge window for her to beat her.