What on earth was this supposed to prove? Rika is quite literally a shell of its former self and it can only return to his volume 0 state at 5 minutes per time. Now please explain to me how the fuck Rika got stronger.
Btw, the Gojo and Yuta comparison falls flat, as Gojo has less CE but he uses it more efficiently due to the six eyes. Rika has no such thing helping it.
You certainly proved something answering your own question without realising, apparently.
Arbitrarily claiming Rika is “shell of her former self” doesn’t make it so.
Rika no longer having infinite CE (which is a separate topic, but whatever) also doesn’t mean Rika has to be weaker.
There is no indication that she is. Quite the contrary considering the feats Yuta has been pulling.