Mihawk special lvl up

so i wanted to start farming mihawk the whole time, now since i got several of him i don't know if i should fuse them all into the first version of him or the last version, if i fuse them all in his early form will the special lvl stay in his final form aswell ?

i have actually no clue about that hope to get some nice tipps thanks at all

It doesn't matter in what version you fuse your copies.
The special stays the same and the level will be the same after evolving. So just do what you want

thanks alot m8 let's try to get that special max

Also another question is us better u fuse them one by one or do a bulk fuse of 5 ?

I always try to use 5, but it makes no difference, so just as you want

i find in my experience that fusing 5 has a higher chance then 1 by 1. But technically it's the same.

I've read somewhere that 3 at a time work even better. So i tried yesterday, and only once i hadn't a skill up, so for me that was a good way

Well i got him below the Whitebeard special range so it is totally fine for me even to the grind was so boring at some point.... but i got a few lvls