Facts, guaranteed to be ass.
Yeah, I have a hard time seeing some random faction of evil giants being a legitimate threat.
For starters, Elbaf has never been portrayed as being some sort of dystopia like Wano was, and we already know that a significant chunk of the population will be pro-SH. So this group of evil giants would have to be notably stronger than a Yonko crew to be a serious threat to the SHs + the pro-SH giants.
Second, the threat needs to escalate. In Wano, the SHs had to face Kaido, the Beast Pirates, and BM. In Egghead, they had to face the Seraphim, Kizaru, and the Gorosei. Don’t see how an evil group of giants can be a greater threat than that.