Couple of thoughts on lines ...
I really, really, really wish we could forget about line numbers around here. Brind'Amour simply doesn't use his lines that way, and honestly neither do most coaches. And they use the lines completely differently on the road than they do at home so the whole thing has turned into a shorthand that doesn't save anyone any time any more. Same with position numbers in soccer ... this guy or that guy should be a No 8 instead of a No 6 when they both get used the exact same way in a particular coach's system. Whatever ... when the shorthand expressions don't fit, they just muddy the water.
Here's what we know ... Aho will be the center that gets most of the optional offensive zone faceoffs and the one that will get line mates geared to maximize scoring. Call it a first line, call it a cheeseburger ... whatever. Staal will almost certainly get at least one wing who can check and will get the majority of the optional defensive zone draws. Call it a 3rd line, call it a checking line, call it a Graf Zeppelin ... don't care. Huala will likely center a line that attempts to take advantage of his mobility and versatility. That will probably mean that at least one guy who can really move it will stick with Huala, while his other wing will probably be manned by a guy who can protect physically a bit. I assume that Dzingle will be the other speedster to play with Huala, and if those two get it going they'll get ice time. Guaranteed. I can see that one as a change of pace line that Brindy will try and get paired up with a cumbersome opposing line when the other team tries to "go heavy" and as a second unit to start plays in the offensive zone. Wallmark or whoever emerges as the grunt line center will do the usual ... play D, forecheck their little brains out and be as annoying as possible.
First, second, third ... that will be determined by icetime and matchups. 4th? Yeah ... that's gonna be Wallmark and whoever he's got with him on a given night.
I think a MUCH bigger deal for camp and the preseason is to find special teams groups that actually work.