Zohorna's upside seems to be a play driving bottom-6 player, which is probably the highest upside forward they have (not named Yager or maybe Puustinen). I think the more appealing thing is that he and Eller seem to have some really good chemistry, so I really don't want them to break up that duo anytime soon.
This team doesn't need any young guys to come in and perform at legitimate top-6 levels, they just need to get some young guys who can be strong bottom-6 guys. Eller and Zohorna looks like 2/3 of their 3rd line going forward, I really hope they find a 3rd guy for those two.
I actually don't know that they have a great fit for those two. Even with what those two have shown so far, I think you need a natural goal scorer with them. I think Eller and Zohorna both have good playmaking skills and are good at opening up space, but you need someone who can finish their chances. You also need that guy to be good defensively, just from what is required in a bottom-6 role. I'm really not sure who fits that. Clone 2011 Tyler Kennedy and put him on that line and I think that would work really well.
Hell, if Kapanen was still here, I think he'd be a pretty damn good fit with those two. You'd never have the cap space to be able to afford him, though.