Listen tho’, I am 200% convinced that it is supposed to be super relevant and a big hint to a significant plot development (or answer about Guts) in the future. 

I mean, look:

first there was the adorable Chitch…

…as a few random episodes right in the middle of vol37, before we switched to Rickert/Falconia and then again to Guts’ party finally reaching Skellig. And since I don’t think Sensei does random in his story… well, it must be narratively meaningful somehow. x)

Then, of course, there are all the references to Puck before they had even met, which in my opinion definitely hints that Puck and Guts could be linked by fate.

• There was Judeau with some elf dust coming from Puck during the Golden age…

• but also Rickert with some more elf dust coming from Puck, which was used to heal Casca and Guts after the Eclipse…

Puck who, unknowingly, was also of a great help to Guts during his two years as the terrifying Black Swordsman, as pointed out by Rickert once again…

…just like he was

already

hinted to be pretty significant to the plot in a very obvious way recently…

Puck who calls the Beherit Guts found in the first arc “his”…

and it’s been mentioned too often by now for me not to think it’s possibly hiding something relevant:

So I don’t know exactly what may link Guts and Puck, but fate is at work here and I’ll be really surprised if Puck doesn’t have an even bigger role in the future than during Guts’ Black Swordsman days.

It’s possible that the Beherit is really supposed to be his, especially since Puck knows all about Guts’ revenge against the Godhand and even met them in the very first arc. Not to say that Puck would sacrifice his friends or anything, but just that he may be the key to Guts going back to the Abyss

for the third time

in order to face the Godhand.

Otherwise, to be honest, I have had this super crack theory (i.e no real hint) for ages that maybe, 

Guts survived through his rather savage birth circumstances because Puck happened to pass by and heal him? Then Gambino showed up soon after and the rest is history.

After all, we don’t know exactly when Puck left Skellig Island all those years ago, just like we don’t know if that circus troupe is the first group of humans he came upon (unless it was mentioned and I’m misremembering something?). 

Besides, in Berserk, the notion of fate is extremely important, that’s why even Griffith couldn’t escape becoming Femto even when the Beherit was taken away from him that one time. So if the Skull Knight says that there is a possible tie between Guts and Elves, then I’m ready to believe it’s the case.

The question is does it come from Guts’ past or will it be explained by something that has yet to happen? Whichever it is, I’m pretty sure it’s going to be very important either to Guts’ character or to the plot iself (or both). :))