It is still "Guns N' Roses" even without the original line-up. Axl owns the name "Guns N' Roses," so technically, he is still playing with Guns N' Roses.
In name only....unless they are all playing onstage together, they can NEVER be GNR....couldn't produce the same sound without all the elements the same....that's what I meant. Just like the old band Lynryd Skynryd is still around, but in name only. Without Ronnie Van Zandt as the frontman, it's not the same sound no matter how hard his brother tries to sound the same.