First of all, because of royal blood

In the animation, we can know that royal blood has an additive effect on the height of giants. An obvious example is Beastly Titan Kiko. The previous generation of Beastly Titan was only 15 meters, but this generation of Beastly Titan Ji can grow to 17 meters. As members of the royal family, it is not surprising that our sticks have become bigger.

Second, because the most powerful giant potion

In the third season of animation, Rod caught hysteria and Allen. They held an inheritance ceremony in a special place. Rod took out some very rare things in the wall, among which spinal fluid that became a giant was one of them. The giant's spinal fluid says "the strongest giant" potion, which means that this giant potion is not an ordinary giant potion, but a special giant potion. From this, we can think of those 60-meter-high giants in the wall, and those 60-meter-high super giants are also possible.

Third, the special way of intake

We know that the general way of giant transformation is through injection, but Rod adopted a special way this time, that is, licking spinal fluid. This way of absorbing spinal fluid has not been done by others in the animation, and it is likely to become an alien species in this way. There are many strange things about the strange giant, and it is likely to become very huge.

So why is the Rhodes giant so big? I think it is the superposition of three factors, and three factors have created a super giant.