Gio was quite lucky in that he was one of the few standout pros of his era, likely because he was good looking, had some good choreo skills, lucked out with partners and most importantly, wasn't a cookie-cutter Burn The Floor clone like most of the others hired in the same time period.
Vito, Nikita, Jowita (among others) have all made an immediate impact in a way that people like Amy, Nadiya & Graziano simply didn't, and most of the new ones are also superior dancers over the likes of Janette, better choreographers than Aljaž and more likeable than Kevin or AJ. With that lot being his competition, naturally Gio got quite a good run as top dog and it took until his 7th/8th year before he lost that. Now he doesn't know what to do with himself.