Yes she's biju level in terms of size. Considering Gambunta was able to hold down the fox and was roughly it size. Katsuyu and Gambunta are the same sizeAre you implying Katsuyu is bijuu level here?
Shino can plant bugs inside Katsuyu, summoning them after having spread them all over her body, and they will rapidly eat through her body before she is capable of doing anything. Even if she were to split apart, the insects would still be inside her, eating her.
Okay, suppose for arguments sake, I agree she can fend the insects off by punching the ground. What if they are fighting in a desert, where she is incapable of doing that, would she still be able to avoid his Insect Sphere technique ?
No, Obito was caught, couldn't move, and had to resort to a S/T ninjutsu in order to escape it.
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Shino never showed that ability. Scans? Like I said katsuyu isn't a game breaker or even needed tbh. If they were in the desert it would be the same. Sand will be blasted out of the ground and bury the bugs.
He was caught because he didn't take them serious for the last time. Yes it's fast but it would never catch him if he was serious