I think this is a fantastic problem to have. Gordon has been (mostly) outstanding for us but as has been rightly stated he struggles with the tippy tappy style of play and doesn't dominate his box. Mostly hangs about his goal line and 6 yard box to make amazing reflex saves. Getting towards the end of a good career.
Bain came in last season and was outstanding for us. He was so good some people argued on here he was worthy of being our player of the season evrn if he only came in early January. I think he needed a rest as he went off the boil early on this season, but training day-to-day with - snd competing against - Gordon and Forster will bring him on further.
IMO Forster is the best goalie we've had a Celtic in my time. I don't think he was given any guarantees about playing but knew he had to do something yo kick start his career. He obviously loved his time up here and so feels comfortable about settling here quickly and confident that working with our under-rated goalkeeper coaching staff will get him up to speed very quickly and do he will grab his chance when it comes.
I think Gordon will start for the next 3 games unless there is something negative happens.