Usually if you put session musicians in the place of a drummer, a bass player and a rhythm guitarist of a band you whilst getting perfectly acceptable technical efficiency would usually lose the colour, the light and shade and the unique stuff that makes a band.
But given this is Oasis, a band without any real colour, light, shade and anything unique about them - it will make no difference at all as the drummer, bass player and rhythm guitarist just grind away personalityless playing the rudimentary shite the original members played.
I might be wrong but for their last few records they didn't even have a full time drummer - they used Ringo Starr's lad - who was a touring member....