Millar has played on LW, FW, and LWB in recent games for Canada. His club position has primarily been LWB/LW.
Corbeanu has played on RW but everywhere across the front 3 in his times at Hertha, Blackpool, and Grasshoppers.
Brym primarily a CF, but has played at club level at RW.
What you're saying sounds true about JH was "very methodical" and you say less depth on the leftside....but to me it was stronger than the right. We had Davies, Hoilett, Adekugbe, and Millar whether we had 3 or 4 in the back. In a 3 back Davies would start, Sam was his backup. Back 4, Davies would start, Junior would be back up. So when was Millar someone's "backup".
I remember the Jamaica game...where Liam started on the RW because Tajon and Richie were out. And Hoilett was on the bench...was that part of his methods?
Point of what I'm saying is Millar was the final pick for the rogue player. Meaning a guy who can fill in where needed. He does that better than Brym or Corbeanu. He's way more versatile than both those guys and I think that's why he got the "last spot".