The only techniques I can think of that can counter power are Higuma Otoshi, Rai, Hyakuren, and Hadoukyu Parry.
It's bothered me for a while. But shouldnt Shiraishi's
Entaku Shot counter power shots to an extent?
Like... Shouldn't Shiraishi be able to shit on Rai since Entaku Shot uses the frame of the racket.
I know Sanada > Shiraishi obviously but seriously, if he has a special shot that uses the frame then surely Entaku Shot can counter a variety of power shots no?
My theory to Hyakuren is that it is a short burst of Muga. Allow me to explain. Muga on its own allows the user to use techniques they've seen in the past. Hyakuren first off uses Muga to immediately copy the shot. Then since the Muga energy is concentrated on the arm, the shot is returned exactly the same as it came but with the properties are doubled.
So why can't Rai be returned with Hyakuren? Well, Rai is hit with the frame, no? When Tezuka tried to return it with Hyakuren with his racquet gut he failed. The racquet gut cannot replicate the properties of the racquet frame. So if Rai was hit, then a Hyakuren utilising the frame should theoretically work.
I believe Hyakku Ren only applies to shots using the strings of the racket.
And secondly, Hyakku Ren-1-hand is for one-handed shots from what we have seen.
The standard Rai is a Two-Handed Shot so no, Hyakku Ren cannot return Rai. Since Hyakku Ren is always only in one part of the body.