Confidence in one's own power matters.
Well tell me , why he can't keep his mask on ?
Tensa Zangetsu say's it to his face , Doubt , fear , hopelessness.
Look at the way his inner world has changed , Tensa makes a point of it.
Ichigo can't fight when he is like this , he lost to Grimjow and Yammy the first time when he was in a similar state.
I mean look at him in this chapter.
He is not at his full potential , He has been like this since Cifer kicked the Bucket. And he has not been able to fight Aizen in any serious fashion, He was barely able to fight Yammy , He had Half a decent fight with Gin. And trembled in fear of Aizen whilst he laid waste to 3 of Bleach's most powerful characters.
So Forgive me if a mis-understood what was meant by Current Ichigo. If you mean Ichigo when he fought byakuya , Grinjow and Uquiora . It's tough one as we don't all of Naruto's powers yet.
But i will give it Ichigo , unless Naruto gets a technique to deal with Blade of tensa Zangetsu.
Ichigo take on goku? Kid goku sure but adult goku no way. How about making another argument.
I reckon Ichigo at full power , with full Hollow power(You saw the fight with Cifer, it was a bit more DBZ with the pure scale of energy attacks), And a more powerful getsuga tensho, he can fight SS1 goku on somewhat even footing. He may no have the raw power, but he does have the speed and the blade. Goku does have the martial art's but being on the same level is not the same as winning.
Well kind of yhea , First thing Grimjow say's about Ichigo's Bankai is that it is average speed.
Because Ichigo did not go as fast as he did against byakuya he can't do it anymore? Eve n though he is stronger than that time?
Yet Byakua could barely keep up with Ichigo the first time. Sure Ichigo got stronger by using his Hollow powers , But Ichigo has never been as fast as he was then. He hasn't used those After Images ever again. And curiously enough he Never suffered from His Bankai's side effect of him getting crushed by His bankai's spiritual pressure. To be Fair i really think he is unable to realise his full power because of what is happening inside of him.
From what i understand in Bleach your inner world is pretty important stuff. Tensa was pissed for a reason , and he dragged out mr.NoName for the same reason. And he cited him as the cause.
The way i see it Ichigoa had better control of his Bankai before then now. And the state of his inner world has some bearing on his power.