Fayte,
Your opinions are obviously not taking into account any knowledge of literary techniques and devices. They seem to be influenced more by fandom.
You are overlooking the the extreme reverence the author has placed on the Pinnacle of Perfection. Only person in the last decade. Who was that again. Oh yeah! Ryoma's dad. The person who has been established as his symbolic greatest hurdle. The story is about Ryoma's growth, the Pinnacle of Perfection is PURELY a literary technique to show his growth in relation to his father's.
When Chitose said the Tooyama was closest, this isn't the author saying he will get it. This is the author demonstrating how strong Tooyama is, without having to illustrate a match.
Only one person is going to achieve it, and we're dumb if we dont' know who that is. (Unless of course Ryoma achieves it here in the Shitenhouji match, then of course it is free game for any character)
It is also COMPLETELY possible for Rikkaidai not to be in the finals. (I don't know at this point). Another COMMON literary tactic for introducing strength of an entity without showing it, is to have it defeat some other previously established strength. (a mini scale would be the introduction of Fudomine). I would however be disappointed not to see Yukimura play Echizen (which will happen if Rikkaidai makes it), but I would be happy either way.
As you said, Sanda was the man at Kantou, literary rules 101: the main character never jumps a hurdle twice, He will not be the focus of the nationals.
Just in reading the nationals you can already see the focus. Tooyama and Yukimura. Remember the MAIN focus of the story is Ryoma's growth. Ryoma will not play Sanada again, and we can therefore assume that Sanada won't stand in the spotlight. Sanada has fallen to the wayside. Atobe surpassed him. Why was that mentioned? Not to show Sanada's growth!
It was to show Ryoma's growth.
Think of it as a race, and each match a hurdle. Ryoma won't double back to jumb a hurdle he already has cleared. (Even if it wasn't Sanada at his absolute best, we're not talking real world, we're talking literary technique. Once Ryoma beats someone, he never plays them again {to demonstrate growth that is, he may play them on other levels})
And NO ONE is blindly assuming Yukimura to be stronger than Sanada. We are taking into account everything the author has done (the reverence from Sanada, the Yukimura - Atobe encounter, ect ect.) Besides looking at it a it's most basic level, you also have to take into account what Konomi has said about Yukimura in interviews.
You're blinding thinking the author is going to treat Sanada fairly. News flash, ONLY the main character gets treated fairly. Only the main character (/team too in this case) get to grow. How many other teams/players had real growth drawn? None. Not Hyotei, not Fudomine, not Yamabuki, and Rikkaidai will be no exception. Sanada won't grow. He may show power that wasn't shown before, but he will not grow as a player. Atobe was only shown growth to be a new hurdle for Ryoma.
As an aside.
I'm stumped for what will happen to Fuji (the man) if Rikkaidai should make it to the finals. Unless Tezuka is taken out in his current match, then what's left for Fuji? I DON"T WANT TO SEE HIM IN DOUBLES FOR THE CHAMPIONSHIP!!!! Although rereading makes me lean towards Rikkaidai losing in the semis. (I want to see Yukimura
)