Cuz 6-man Pf just laugh at sniper and Jaeger need a lot of babysitting to be effective. Also Pf blob + JT = ownage in team game.
The Two commanders are two sides to the coin. You can ambush a sniper with JLI or attrition it out with Fusiliers. Scavenge drops in value the more players are in a match and Breakthrough Scales the more players are in a match.