I see Aston-Reese as a regular next season. He brings a lot of the things most of the names being bandied about bring, and he's cheap. And he even was good enough for Sullivan to utilize him on the PK. I think he replaces Kuhnhackl as the fourth-line LW, with a chance to move up if what he brings to the table is required on a higher line...which is possible.
I also don't think we will qualify Kuhnhackl. I don't see the point.
So, two thirds of a pretty good fourth line could be Aston-Reese and Sheahan. We might need a fourth-line right wing when the dust settles. Or, we might start Sprong on that line and work him up as the season moves along.
Basically, before we start bringing in fourth liners, we need to figure out the first three lines. We should not work backwards.