Could Finn Balor possibly form an alliance with AJ Styles and the OC in a few months when he returns from his sabbatical to “recharge.” AJ has publicly stated that Balor will always have an open invitation to join the OC. It’s quite frankly surprising that WWE has never chosen to orchestrate more run-ins between Balor and Styles considering they have obvious chemistry in the ring (as was shown in their October 2017 match morning AJ filled in at the last minute for Bray Wyatt due to illness).
They also have a storied history in Japan because both men were leaders of the famous Bullet Club. WWE doesn’t usually get too into acknowledging other wrestling companies (even if they are on the other side of the world). Balor joining the OC is a very interesting possibility, as he could make the group even more dominant than they already are.