tldr - too many untested/inexperienced players for too few slots
There's no doubt the roster is in flux right now.
Assuming that Necas and Jarvis are re-signed, we've got our 1st and 2nd line RWs (unless Rod insists on playing Jarvis w/Staal and Martinook - a slot in which he's been successful). And there's the distinct possibility that one of them slots in as 2C.
However, I do believe that Roslovic was signed to play either 2RW or 3RW (and provide some RH faceoff protection, albeit he's a bit weak in that realm). My question about Roslovic is whether or not he has the defensive chops to play on what is really our shut down line. My sense is that he was Necas insurance, but we probably don't need that, at least not now.
As I see things right now, I believe we have 2 LW slots (2nd and 4th line) and one or two RW slots (depending on how 2C shakes out 2nd, 3rd, or 4th line) that will drive positional battles during camp and pre-seasons. Given that one of Drury or Kotkaniemi could be moved to LW, that might open a center slot as well. But as it stands now, I see these competitions shaping up (given our current roster):
Left Wing - Svech and Martinook are our likely 1st and 3rd line LWs
Leaving:
Lemieux
Carrier
Robinson
maybe Suzuki
potentially Kotkaniemi and/or Drury
Jaaska is a potential wild card (but likely AHL fodder or 13th forward)
Right Wing - Necas and Jarvis have the inside track to 1st and 2nd line RW (again, unless one of them moves to center)
Leaving:
Roslovic
Unger-Sorum
Nadeau
Blake
Unless some move is made, I'm wondering if this is what Roddy is thinking:
Svech/Aho/Necas
Kotkaniemi or Drury/Roslovic/Unger-Sorum
Martinook/Staal/Jarvis
Carrier/Drury or Kotkaniemi/Robinson
Lemieux
We know he liked FUS who almost made the team last season. If he could handle the wear and tear, perhaps you swap Jarvis and FUS putting the kid in a more defensive role.
Keeping with Rod's tendencies, it would more likely shake out to be:
Svech/Aho/Necas
Kotkaniemi/Jarvis/Roslovic
Martinook/Staal/Unger-Sorum
Carrier/Drury/Robinson
Lemieux
I think the team would like to see both Blake and Nadeau get big minutes in Chicago. I also think that they really want to see what they have in Trikozov (a bit bigger, tons of skill, very good skater) who also might surprise in camp. Jost, to me, is AHL filler. Josiah Slavin and Juha Jaaska are the 14th and/or 15th forwards. As much as I liked some of what I saw in Suzuki, I don't see where he fits in the organization.
My long winded two cents worth...