Anybody on Rikkaidai with the exception of Jackal and Bunta could have played and probably won against Tezuka at that time. Renji? better by far. Remember Tezuka only had Tezuka zone and zero shiki drop shot.
Secondly, Fuji was NOT better than Kirihara. He even admits so himself when he said "If I wasn't blind, I would have lost." Kirihara played an amazing game.
Again, as for Inui/Renji, Renji had skill that matched Tezuka at that point in the series. Inui beating him just for the sake of a cheesy plot was really stupid. I would much rather have Inui just lose and by far. That would be a lot more realistic, considering the amount of hype Konomi made for the "Champions" Rikkaidai that were of "Tezuka level."
Well, TZone and Zero-shiki are nightmares to stop. Remember even Atobe was on his knee's to those two moves and frankly, Atobe would beast everyone in Rikkaidai but Sanada and Yuki.
Why is Fuji worse again? It simply says that Fuji couldn't have won unless he went above his limits by allowing him to heighten his other senses (to me this means focusing your other senses...unless Konomi now decided to break biology...I mean seriously your ears don't suddenly hear more frequencies. You just get better at analyzing the data coming to your brain from your ears. So, focus)?
http://www.onemanga.com/Prince_of_Tennis/223/05/
During this match didn't Kirihara also go above his limits with SoA?
http://www.onemanga.com/Prince_of_Tennis/222/02/
So, breakdown...
Pre-Match
Kirihara - 22
Fuji - 22
Kirihara must go red eyes to become stronger than Fuji.
http://www.onemanga.com/Prince_of_Tennis/216/18/
Even though he still loses the first match...
http://www.onemanga.com/Prince_of_Tennis/217/18-19/
Either way, I think this win was simply Akaya getting started in Red Eyes mode.
Fuji becomes semi-serious....
http://www.onemanga.com/Prince_of_Tennis/218/17/
During match
Kirihara Red Eyes - 25
Fuji Semi-Serious - 24
Fuji goes blind to focus more...
http://www.onemanga.com/Prince_of_Tennis/219/03/
Kirihara loses Red Eyes...starts pushing as hard as he can...with out SoA or red eyes...
Kirihara Completely Serious - 26
Fuji Blind Focused - 31
Kirihara goes SoA to try and become stronger...
http://www.onemanga.com/Prince_of_Tennis/221/08-09/
Kirihara SoA - 30
Fuji Focused - 31
Fuji still wins in the end...
Post match
Kirihara - 30
Fuji - 31
Fuji
wins.
http://www.onemanga.com/Prince_of_Tennis/222/16-17/
Onto Inui/Renji match...hype really means nothing, results are what matter...bleach has taught me that QQ. *Holds back every fiber in his being not to rant at bleach*
Also, its quite possible for Inui to also have reached "Tezuka" level by the time he fought Renji. Inui trained freaking hard. Now could he beat TZone...I don't think so...but then again I don't think Renji could have either.