Harald was the strongest weapon given even base harald is above gorosei like saturn.
You are not getting the point. Base xebec >>> Base garling without imu amp. Hence garling became a laughting stock as even with HK amp he was a fodder.
Your base power matters of course. If xebec had gotten abys contract powers for example , he would be above DR amped version of himself.
For a given same character the hierarchy follows. Unlike garling , base xebec and base harald were shown to be equal. Hence Hk Harald is stronger than DR xebec.
I get your point but like i said nothing show that HK harald was stronger than DR rocks .
The fights get done so differnt that DR rocks fight destroy a island and they had to use all there haki to get him out of DR .
Harald fight end with i love you son give him me a attack that can kill me while i do nothing before i heal back and lose my mind .
Also like i said it was never said he was there strongest weapon above the elders .
We don't even know how the elders were is base before they get there powers and they have contract above his and awaken MZ DFs.
If anything harald don't even look more impressive that Saturn to me since when you get regen you just take hits like we see all of them doing .
At least Saturn did some more fancy attacks lol.