You think that Guts is already above Zodd ?
He will be that's sure but I don't know for now. Once he will master the armor I can see Guts beating Zodd. I think Zodd is still portrayed as a huge boss and future great opponent.
I agree for me that Locus is the strongest from the new Hawk band after Zodd.
Rakshas didn't impress me a lot to be put above Grumbeld.
About the Femto vs Void, I don't know. Griffith is the main villain but Void seems to be the one in charge of the god hand, the boss of the thing.
At the Hill of Swords, it seemed like pre-BA Guts was slightly stronger than serious Base Zodd. Given how much of a boost the BA is, I feel like it would put Guts at approximately equal to serious Apostle Form Zodd, but Guts would squeak out a victory due to just how tenacious he is, as well as his amazing battle tactics.
For now, I'm basing my ranking of the 5 BotH commander Apostles on the order in which they came to Griffith's aid. Zodd was first, then Locus, then Rakshas, then Grunbeld, and lastly Irvine.
Also, I think that the 5 commanders probably parallel the 5 commanders of the orginal Band of the Hawk. Zodd is obviously the Guts of the group (and he might also end up ditching the Band of the Hawk, like Guts did). Locus is the Casca of the group (which would make him the 2nd strongest commander) since he seems to be the most obsessed with Griffith, like Casca was, and he also likely has an elegant fighting style, like Casca. Grunbeld is the big, strong dude, like Pippin was. Rakshas and Judeau are kinda similar since they both seem like the stealth types. There's not really any noticeable similarities between Corkus and Irvine though, so that might discredit my hypothesis.
In my opinion, the God Hand likely reset every millenium, with the former 5th God Hand becoming the new 1st God Hand. This was foreshadowed when it was mentioned that 4 Angels came down to help the wise man (aka Void) the Gaiseric imprisoned, meaning that Void, the current 1st God Hand, would have been the 5th God Hand of the previous cycle. Therefore, the 1st God Hand has superiority over numbers 2-4, but not the 5th since the 5th will become the new 1st. I give Femto the edge though due to him being the main villain and the one chosen for the Incarnation Ceremony