Originally Posted by "Loki
I'm afraid we are going to have to disagree here.
By your logic, it would also be unfair if another title than New Avengers (say, Ms. Marvel) had decided to include a flashback to the Alpha Flight battle with the Collective, because you might not have the budget to buy that or might not realise they were providing more details about the battle there? But stuff like that happens all the time in comics - By your arguement, the writer should not have done this.
The handbooks have always been able to clarify, expand on, or even add brand new information (all with case-by-case editorial approval). It's part of their remit.