They certainly didn’t sell Burrows as bottom 6 depth when they acquired him, this is just revisionist history.
Dorion: Very happy with acquisition of Burrows
Go to 5:15, Chris Stevenson asks Dorion whether adding Burrows gives Boucher the opportunity to have a 4th line. He’s got the opportunity to say « yeah this is a great depth acquisition » and does not. Dorion responds that Burrows will slot into the top 2 lines and allow everyone else to play in their proper slot. He also says Burrows can play up and down the lineup which, to me, means more than a 4th liner who can ineffectively stand in front of the net on the PP.
He also sold him as a PK option which isn’t the case this season.
They clearly expected to be getting more than a 4th liner.
Also interesting that he hypes up several prospects including Paul (who hasn’t taken a step forward) and Perron (who he has laid into this season) as justification for not needing Dahlen.