Bubble doesn't genuinely exist until we play 15 games or so and have a better idea of how this team has fared.
Atop of that, seasons are always split into two halves so bubble is recreated again come january/February time as some teams simply fade or get sussed second time round.
Will that happen to us?
Maybe.
What I have noticed is that our play is currently defined on a pass and move dynamic - creating space etc, which given the relentlessness of the games in this league could prove to be an issue as is a more fitness reliant and tiring way to play, especially of 46 or so games.
That said the issue will be mitigated quite heavily if we keep this squad and maybe add one more CM. If we do that then I think we'll have a group of players more than capable of rotating in and out and keeping the same levels of play, quality and energy.
Especially if players like Reed, Kongolo and Cairney (less hopeful on cairney) also make it back into full fitness and stay fit for a long period.