This evidence
Corberan played Furlong as right midfield against both Preston and blues…imo he had 2 of his better games in the last two seasons .
No he didn't the formation was the same 3421. I know jouno's stated we'd reverted to two CH's but this is far from the first time they've got it wrong, they clearly don't understand the tactical side of the game enough. CC himself put one local journo right and corrected him. We were endlessly told we were playing 4231 last season but we werent it was 442. Not one journo to my knowledge understands that even now.
Once someone says something others jump on a bandwagon and a false "truth" is created. It's not just in football it happens in every day life all the time.
As Gary Megson once said (and people need to understand this) - You don't attack in formations.
Formations are how you line up off the ball when the opposition has possession. In this case Phillips clearly drops into a back 5. You could actually call it a 541 which actually would be more accurate than a 3421. However when teams play three CH's everyone calls it a 3. When teams play with two CH's no one calls it a two at the back. That's one of football's strange things. If you look at Liverpool for example TAA and Robertson play every bit as advanced as a Wingback but everyone says they play with a back four not a back two.
Because of idiosyncrasies like this you can often debate exactly how a team lines up but in our case at the moment it's always with a back three CH's.
What teams do ON the ball is strategical. Players don't play football in lanes particularly in the modern game and there are tweaks going on all the time.
Next time the other teams keeper has the ball and you get a wide shot on TV (or if you have an appropriate vantage point at the game) look where the players are positioned and that gives you your formation.