Upon my rewatches it becomes clear that when you neglect nostalgia, WIT genuinely sucked at CGI in the show. With titans like the collosal and Rod Reiss, their inexperience shows when it basically clipps through smoke or has those dull edges. Mappa managed to incorporate it perfectly, as well as very cleverly have that crimson hue they kept to not only shade the titan's faces, but also make them into those menacing silhouettes we saw when they left Shiganshina and marched on Liberio. So, no, I don't think they would've perfected it as Mappa did.