I don't think previous performances were a huge factor in him starting against celtic - probably more to do with having more time to learn his role due to not being on international duty, and his pace was an obvious asset when tracking celtics fullbacks/blocking runners - it obviously worked because celtic never had a shot on target.
Also, Barker will be lucky to make the bench when Aribo and Roofe are fully fit, but still has a role in the squad and he'll do a job when called upon.
Really not seeing the issue here at all tbh.
You can still buy booze from the supermarket, not the same but get cargo and find a spot and enjoy the Belgian beer. Mind a lot of there beers are rocket fuel and don't taste like petrol like the likes of tennents super do👍