It is definitely something mental going on with Oda. He is known for landing the most ridiculous combos in practice, like 4/3/3/3s, and yet he only occasionally lands a successful quad in competition. We also have one huge but also very understandable example of something mental affecting Oda's physical abilities: his gigantic meltdown at Worlds last year was directly precipitated by the news that his then girlfriend (now wife) got pregnant (he was stressed about how to break the news to his parents, I think? I know he was incredibly stressed by the news somehow), which led to his worst performance in competition in years... possibly ever. Again, entirely understandable. It just maybe an example of how Oda is particularly susceptible to less than ideal mental conditions.
I have less insight into how Mirai's mindset affects her physical ability. I still remember vividly how she led after the SP at the nationals before the recent one, then skated a seemingly perfect FS, only to wind up 2nd from downgrades. Looking at her past results, though, it shows a pretty stark record of Mirai leading after the short only to finish lower in the FS, sometimes much, much lower. Is it because she attempts jumps in the FS more likely for her to get downgrades on? Or is the stress of maintaining a lead enough to affect her technique to make her more susceptible to under rotation? I do get the impression, rather strongly, that Mirai is rather scattered brain and can get distracted. That's definitely not a plus.
I was going to say that the idea that mentally fragile skaters excel in the SP but botch it in the FS is a sound one and must apply to Sasha Cohen, 'cause we all remember how she led at the Turin Olympics only to screw the pooch in the long. And it's often said that Sasha is a short program skater. But that is actually not so looking at her detailed record, where she has just as many examples of moving ahead of her SP placement as she does of moving behind it, and many more examples where she maintains the placement. However, there is no doubt that she was mentally fragile. And I remember a lot more perfect SPs from her than I do any perfect FS.
I can't find a detailed record of Michelle Kwan's SP vs. FS placement. Was she the opposite, though? I remember quite a few famous cases where Kwan is behind in the SP, only to pull it together for a perfect FS while rivals crumble. And Kwan is one of the mentally toughest athletes the sport has ever seen.
The FS is definitely a mental endurance test (as well as a physical one). Are there any other skating head cases who excel at the SP but crumble in the long?