Is this something the coach has hinted out? Where are you getting this info. from(source?)?
Source would be that once you fill out the Top 9, there are only so many options to play the 4th line.
All camp, Neal-Richards-Eriksson formed the top line. The majority of camp, Morrow-Ribeiro-Burish formed the second line. All camp (with the exception of one game Vincour replaced Bruno), Brunnstrom-Benn-Ott were the third line.
Wandell was an NHL regular last year before he injured his knee, and he was one of the top PKers on the team. Despite his shoulder injury (and since he was already re-called from a conditioning assignment) it's hard to imagine him rotating with anyone this season.
That leaves those 4 players fighting for 2 spots on the 4th line.