Theway the guy who turns people into blobs of meat speaks reminds me of Shino from Naruto. I wonder if the mangled people will come back to normal after some time, or if the guy has to do it manually.
As a reader I can see that Aizawa is kinda right, people in the class have been motivated by Deku and maybe a bit by Bakugo (mostly Kirishima, but one could maybe count Tokoyami). It's just that he hasn't really seen many of those interactions, like Todoroki with Deku, or been in the situations that he's talking about, like the students vs Stain. So even if he's right, it feels a bit forced.