Hopefully this is a sign that Gauthier will be out for Engvall.
I love Gauthier's personality and think there is a spot for him on an NHL lineup, but it's not here.
Engvall and Robertson optimize the lineup.
It depends how they are going to use Robertson. Putting him on a 4th line is not really using him effectively, unless they plan on using him more as a special teams player. Gauthier makes more sense if they are going with Clifford and Spezza as his linemates... Or if they were really married to the idea of having both Engvall and Robertson, put Engvall on the 4th line RW.
This is most likely just Keefe experimenting again. He wants to see how Robertson (on his own and as a proxy for Johnsson) does on a 3rd and 4th line... And Kerfoot/Kapanen need to get used to having both types of players (Engvall and Robertson, who is relatively similar to Johnsson as a player) if Johnsson comes back at any point. Keefe knows what Gauthier can do by now, so as long as he is getting his reps in, he does not care where he is playing. Petan-Gauthier-Korshkov is actually a pretty good all-around line.