I don't think it's an excuse, but I think ignorance of Tira was an important factor in the outcome overall. It takes more than just a day to adjust to a character at that level of play and it gave Decopon an advantage at certain points in his pressure. I mean, Something Unique's match wasn't just him getting bodied. You don't get that look of absolute despondency unless you feel like you're missing something completely.
That being said, the fact that Shining Decopon could wrangle Tira through thick and thin demonstrated something beyond normal player skill. I mean, Tira is basically the only character in the current set of fighting games that screws herself at random and requires crisis management to get back to optimal strength.
I'm glad this game is honest enough to where characters with inconsistencies can still succeed with raw skill.